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Third update to intro.md

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I have created another pull request to revise the introduction page. It replaces : #871, which will eventually need to be dropped. 
This pull request is linked to issue [5357](
https://github.com/QubesOS/qubes-issues/issues/5357).

Besides some formatting changes (one line per sentence ; ### Title ###), I have slightly modified the text in the "why" section. 

Thanks !
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@ -13,166 +13,124 @@ redirect_from:
What is Qubes OS?
-----------------
Qubes OS is a security-oriented operating system (OS). The OS is the software
that runs all the other programs on a computer. Some examples of popular
OSes are Microsoft Windows, Mac OS X, Android, and iOS. Qubes is free and
open-source software (FOSS). This means that everyone is free to use, copy,
and change the software in any way. It also means that the source code is
openly available so others can contribute to and audit it.
<div class="row">
<div class="col-lg-3 col-md-3 text-left">
<p>Qubes OS is a free and open-source security-oriented operating system meant for single-user desktop computing.</p>
<p>Qubes OS leverages <a href="https://wiki.xen.org/wiki/Xen_Project_Software_Overview/">xen-based virtualization</a> to allow for the creation and management of isolated virtual machines called <a href="/doc/glossary#qube">qubes</a>.
Qubes, which are also referred to as <a href="/doc/glossary#qube/">domains</a> or compartments, have specific :</p>
<ul>
<li><b>Purposes</b> : with a predefined set of one or many isolated applications, for personal or professional projects, to manage the <a href="/doc/networking/">network stack</a>, <a href="/doc/firewall/">the firewall</a>, or to fulfill other user-defined purposes.</li>
<li><b>Natures</b> : <a href="/doc/standalone-and-hvm/">full-fledged</a> or <a href="/getting-started/#appvms-qubes-and-templatevms">stripped-down</a> virtual machines which are based on popular operating systems such as <a href="/doc/templates/fedora">Fedora</a>, <a href="/doc/templates/debian">Debian</a> or <a href="/doc/windows/">Windows</a>.</li>
<li><b>Levels of trust</b> : from complete to non-existent. All windows are displayed in a unified desktop environment with <a href="https://www.qubes-os.org/getting-started/">unforgeable colored window borders</a> so different security levels are easily identifiable.</li>
</ul>
</div>
<div class="col-lg-9 col-md-9">
<h3 class="text-center add-bottom">Qubes OS Overview Example</h3>
<img src="/attachment/site/qubesosdiagram.png" height="600" class="center-block">
</div>
</div>
Why is OS security important?
-----------------------------
Most people use an operating system like Windows or OS X on their desktop
and laptop computers. These OSes are popular because they tend to be easy
to use and usually come pre-installed on the computers people buy. However,
they present problems when it comes to security. For example, you might
open an innocent-looking email attachment or website, not realizing that
you're actually allowing malware (malicious software) to run on your
computer. Depending on what kind of malware it is, it might do anything
from showing you unwanted advertisements to logging your keystrokes to
taking over your entire computer. This could jeopardize all the information
stored on or accessed by this computer, such as health records, confidential
communications, or thoughts written in a private journal. Malware can also
interfere with the activities you perform with your computer. For example,
if you use your computer to conduct financial transactions, the malware
might allow its creator to make fraudulent transactions in your name.
Aren't antivirus programs and firewalls enough?
-----------------------------------------------
Unfortunately, conventional security approaches like antivirus programs
and (software and/or hardware) firewalls are no longer enough to keep out
sophisticated attackers. For example, nowadays it's common for malware
creators to check to see if their malware is recognized by any signature-based
antivirus programs. If it's recognized, they scramble their code until it's
no longer recognizable by the antivirus programs, then send it out. The
best of these programs will subsequently get updated once the antivirus
programmers discover the new threat, but this usually occurs at least a
few days after the new attacks start to appear in the wild. By then, it's
too late for those who have already been compromised. More advanced antivirus
software may perform better in this regard, but it's still limited to a
detection-based approach. New zero-day vulnerabilities are constantly being
discovered in the common software we all use, such as our web browsers, and no
antivirus program or firewall can prevent all of these vulnerabilities from
being exploited.
How does Qubes OS provide security?
-----------------------------------
Qubes takes an approach called **security by compartmentalization**, which
allows you to compartmentalize the various parts of your digital life into
securely isolated compartments called *qubes*.
This approach allows you to keep the different things you do on your computer
securely separated from each other in isolated qubes so that one qube getting
compromised won't affect the others. For example, you might have one qube for
visiting untrusted websites and a different qube for doing online banking. This
way, if your untrusted browsing qube gets compromised by a malware-laden
website, your online banking activities won't be at risk. Similarly, if
you're concerned about malicious email attachments, Qubes can make it so
that every attachment gets opened in its own single-use [disposable
qube]. In this way, Qubes allows you to do everything on the same physical
computer without having to worry about a single successful cyberattack taking
down your entire digital life in one fell swoop.
Moreover, all of these isolated qubes are integrated into a single, usable
system. Programs are isolated in their own separate qubes, but all windows are
displayed in a single, unified desktop environment with [unforgeable colored
window borders][getting started] so that you can easily identify windows from
different security levels. Common attack vectors like network cards and USB
controllers are isolated in their own hardware qubes while their functionality
is preserved through secure [networking], [firewalls], and [USB device
management][USB]. Integrated [file] and [clipboard] copy and paste operations
make it easy to work across various qubes without compromising security. The
innovative [Template] system separates software installation from software use,
allowing qubes to share a root filesystem without sacrificing security (and
saving disk space, to boot). Qubes even allows you to sanitize PDFs and images
in a few clicks. Users concerned about privacy will appreciate the
[integration][Qubes-Whonix] of [Whonix] with Qubes, which makes it easy to use
[Tor] securely, while those concerned about physical hardware attacks will
benefit from [Anti Evil Maid].
How does Qubes OS compare to using a "live CD" OS?
--------------------------------------------------
Booting your computer from a live CD (or DVD) when you need to perform
sensitive activities can certainly be more secure than simply using your main
OS, but this method still preserves many of the risks of conventional OSes. For
example, popular live OSes (such as [Tails] and other Linux distributions)
are still **monolithic** in the sense that all software is still running in
the same OS. This means, once again, that if your session is compromised,
then all the data and activities performed within that same session are also
potentially compromised.
How does Qubes OS compare to running VMs in a conventional OS?
--------------------------------------------------------------
Not all virtual machine software is equal when it comes to security. You may
have used or heard of VMs in relation to software like VirtualBox or VMware
Workstation. These are known as "Type 2" or "hosted" hypervisors. (The
**hypervisor** is the software, firmware, or hardware that creates and
runs virtual machines.) These programs are popular because they're designed
primarily to be easy to use and run under popular OSes like Windows (which
is called the **host** OS, since it "hosts" the VMs). However, the fact
that Type 2 hypervisors run under the host OS means that they're really
only as secure as the host OS itself. If the host OS is ever compromised,
then any VMs it hosts are also effectively compromised.
By contrast, Qubes uses a "Type 1" or "bare metal" hypervisor called
[Xen]. Instead of running inside an OS, Type 1 hypervisors run directly on the
"bare metal" of the hardware. This means that an attacker must be capable of
subverting the hypervisor itself in order to compromise the entire system,
which is vastly more difficult.
Qubes makes it so that multiple VMs running under a Type 1 hypervisor can be
securely used as an integrated OS. For example, it puts all of your application
windows on the same desktop with special colored borders indicating the
trust levels of their respective VMs. It also allows for things like secure
copy/paste operations between VMs, securely copying and transferring files
between VMs, and secure networking between VMs and the Internet.
How does Qubes OS compare to using a separate physical machine?
---------------------------------------------------------------
Using a separate physical computer for sensitive activities can certainly be
more secure than using one computer with a conventional OS for everything,
but there are still risks to consider. Briefly, here are some of the main
pros and cons of this approach relative to Qubes:
<div class="focus">
<i class="fa fa-check"></i> <strong>Pros</strong>
<div class="alert alert-info" role="alert">
<i class="fa fa-question-circle"></i>
<b>Note : </b> Head over to the <a href="/doc/glossary/">glossary</a> or the <a href="/faq">FAQ</a> for more information.
</div>
* Physical separation doesn't rely on a hypervisor. (It's very unlikely
that an attacker will break out of Qubes' hypervisor, but if one were to
manage to do so, one could potentially gain control over the entire system.)
* Physical separation can be a natural complement to physical security. (For
example, you might find it natural to lock your secure laptop in a safe
when you take your unsecure laptop out with you.)
<h2>Features</h2>
<div class="focus">
<i class="fa fa-times"></i> <strong>Cons</strong>
<div class="row more-bottom">
<div class="col-lg-4 col-md-4 col-xs-12">
<h3>Strong isolation</h3>
<p>Isolate software as if they were installed on separate physical machines using <a href="/doc/glossary/#pv">PV</a> or <a href="/doc/glossary/#hvm">HVM</a> virtualization techniques</p>
</div>
<div class="col-lg-4 col-md-4 col-xs-12">
<h3>Templating system</h3>
<p> Allow qubes called <a href="/getting-started/#appvms-qubes-and-templatevms">AppVMs</a> to share a root file system without sacrificing security using the innovative <a href="/doc/templates/">Template system</a></p>
</div>
<div class="col-lg-4 col-md-4 col-xs-12">
<h3>Multiple operating systems</h3>
<p> Use multiple operating systems at the same time, including <a href="/doc/templates/fedora">Fedora</a>, <a href="/doc/templates/debian">Debian</a>, or <a href="/doc/windows/">Windows</a></p>
</div>
</div>
<hr class="add-top more-bottom">
<div class="row more-bottom">
<div class="col-lg-4 col-md-4 col-xs-12">
<h3>Disposable VMs</h3>
<p>Create <a href="/doc/disposablevm/">disposable VMs</a> which are spawned quickly and destroyed when closed</p>
</div>
<div class="col-lg-4 col-md-4 col-xs-12">
<h3>Whonix integration</h3>
<p> Run <a href="https://www.torproject.org/">Tor</a> securely system-wide using <a href="/doc/whonix/">Whonix with Qubes</a></p>
</div>
<div class="col-lg-4 col-md-4 col-xs-12">
<h3>Controller isolation</h3>
<p>Secure <a href="/doc/device-handling/">device handling</a> through isolation of network cards and USB controllers</p>
</div>
</div>
<hr class="add-top more-bottom">
<div class="row more-bottom">
<div class="col-lg-4 col-md-4 col-xs-12">
<h3>Split GPG</h3>
<p>Utilise <a href="/doc/split-gpg/">Split GPG</a> to store private GPG keys in an AppVM</p>
</div>
<div class="col-lg-4 col-md-4 col-xs-12">
<h3>U2F proxy</h3>
<p>Operate <a href="/doc/u2f-proxy/">Qubes U2F proxy</a> to use two-factor authentication</p>
</div>
<div class="col-lg-4 col-md-4 col-xs-12">
<h3>Open-source</h3>
<p>Users are free to use, copy and modify Qubes OS and are encouraged to do so!</p>
</div>
</div>
<div class="alert alert-info" role="alert">
<i class="fa fa-question-circle"></i>
<b>Note : </b> Given the technical nature of Qubes OS, prior experience with a Linux distribution such as Ubuntu, Debian or Fedora is advisable.
</div>
* Physical separation can be cumbersome and expensive, since we may have to
obtain and set up a separate physical machine for each security level we
need.
* There's generally no secure way to transfer data between physically
separate computers running conventional OSes. (Qubes has a secure inter-VM
file transfer system to handle this.)
* Physically separate computers running conventional OSes are still
independently vulnerable to most conventional attacks due to their monolithic
nature.
* Malware which can bridge air gaps has existed for several years now and
is becoming increasingly common.
(For more on this topic, please see the paper
[Software compartmentalization vs. physical separation][paper-compart].)
Why Qubes OS ?
--------------
<h3>Physical isolation is a given safeguard that the digital world lacks</h3>
<div class="row">
<div class="col-lg-6 col-md-6 text-left">
<p>Throughout their lives, individuals engage in various activites such as going to school, working, voting, taking care of their families or visiting with friends. </p>
<p>These activites are spatially and temporally bound : they happen in isolation of one another, in their own compartments, which often represent an essential safeguard, such as in the case of voting.</p>
<p>In one's digital life, the situation is quite different : each activity, often intertwinded with its real-life counterpart, tends to happen on a single computing device.</p>
</div>
<div class="col-lg-6 col-md-6">
<img src="/attachment/wiki/GettingStarted/r2b1-qubes-manager-2.png" height="300" class="center-block">
</div>
</div>
<h3>Qubes OS compartmentalizes one's digital life</h3>
<div class="row">
<div class="col-lg-3 col-md-3">
<img src="/attachment/icons/128x128/apps/qubes-logo-icon.png" height="128" class="center-block">
</div>
<div class="col-lg-9 col-md-9 text-left">
<p>Suprinsingly, personal computing devices aren't designed to offer means to enforce the same kind of isolation that people enjoy in the physical world.</p>
<p>What if there were an operating system that provided a kind of digital compartmentalization almost as strong as physical isolation?</p>
<p>Qubes OS allows users to compartmentalize various parts of their digital lives into well-isolated compartments.</p>
</div>
</div>
<h3>Made to support vulnerable users</h3>
<div class="row">
<div class="col-lg-12 col-md-12 text-left">
<p>Thanks to Qubes OS, vulnerable or actively targeted individuals such as journalists, political activists, whistleblowers or researchers can enjoy the same benefit of using multiple computing devices at a fraction of the cost and without the associated loss of usability.</p>
<p> It allows users to do everything on the same physical computer without having to worry about a single successful cyberattack taking down their entire digital life in one fell swoop.</p>
<p>Computing should remain a activity where mistakes can be made and where users can explore the web freely, downloading attachements and clicking on links without having to constantly evaluate a miriad of risk factors.</p>
<p>Qubes OS strives to bring back this experience. It creates a place where users can feel safe.</p>
</div>
</div>
<p><img src="/attachment/wiki/GettingStarted/snapshot12.png" alt="snapshot12.png"/></p>
<hr class="add-top more-bottom">
<div class="row more-bottom">
@ -199,17 +157,18 @@ pros and cons of this approach relative to Qubes:
</div>
</div>
More information
----------------
This page is just a brief sketch of what Qubes is all about, and many
This page is just a brief introduction to what Qubes is all about, and many
technical details have been omitted here for the sake of presentation.
* If you're a current or potential Qubes user, you may want to check out the
[documentation][doc] and the [FAQ][user-faq].
* If you're a developer, there's dedicated [documentation][system-doc]
and an [FAQ][devel-faq] just for you.
* Ready to give Qubes a try? Head on over to the [downloads] page.
* Ready to give Qubes a try? Head on over to the [downloads] page or the [installation guide].
[disposable qube]: /doc/disposablevm/
@ -232,4 +191,4 @@ technical details have been omitted here for the sake of presentation.
[devel-faq]: /faq/#developers
[downloads]: /downloads/
[getting started]: /getting-started/
[installation guide]: /doc/installation-guide/