# ERC Tokens

An ‘Ethereum Request for Comments’ (ERC) is a document that programmers use to write smart contracts on Ethereum Blockchain. They describe rules in these documents that Ethereum-based tokens must comply with.

While there are several Ethereum standards. These ERC Ethereum standards are the most well-known and popular: ERC-20, ERC-721, ERC-1155, and ERC-777.

Visit the following resources to learn more:

- [@article@What are Ethereum request for comments (ERC) Standards](https://dev.to/envoy_/ks-what-are-ethereum-request-for-comments-erc-standards-5f80)
- [@article@ERC-20 Token Standard](https://ethereum.org/en/developers/docs/standards/tokens/erc-20/)
- [@article@ERC-721 Token Standard (NFTs)](https://decrypt.co/resources/erc-721-ethereum-nft-token-standard)
- [@article@ERC-1155 Token Standard (Multi-Token)](https://decrypt.co/resources/what-is-erc-1155-ethereums-flexible-token-standard)