Contracts that follow the ERC20 Standard are called ERC20 tokens. They are used to represent fungible assets.
To create an ERC20 contract, it must implement the following interface:
rust {{#include ../../listings/applications/erc20/src/token.cairo:interface}}
In Starknet, function names should be written in snake_case. This is not the case in Solidity, where function names are written in camelCase. The Starknet ERC20 interface is therefore slightly different from the Solidity ERC20 interface.
Here's an implementation of the ERC20 interface in Cairo:
rust {{#include ../../listings/applications/erc20/src/token.cairo:erc20}}
There's several other implementations, such as the Open Zeppelin or the Cairo By Example ones.