## Token standards

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* ERC stands for Ethereum request for comments. 
* These are technical documents written by Ethereum developers for Ethereum community. 
* Each such document contains a set of rules required to implement tokens for the Ethereum ecosystem.
* You can say ERC is a specific type of EIP.


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### [ERC20](https://github.com/bt3gl-labs/Blockchain-Hacking-Toolkit/blob/main/Solidity-Expert/Token-standards/erc20.md)

* In the case of ERC20, a transaction sending ether to an address changes the state of an address. A transaction transferring a token to an address only changes the state of the token contract, not the state of the recipient address.


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### [ERC777](https://github.com/bt3gl-labs/Blockchain-Hacking-Toolkit/blob/main/Solidity-Expert/Token-standards/erc777.md)


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### [ERC721](https://github.com/bt3gl-labs/Blockchain-Hacking-Toolkit/blob/main/Solidity-Expert/Token-standards/erc721.md)