ERC-20 Token Standard

ERC-20 is Ethereum's standard for fungible tokens—digital assets where each unit is identical and interchangeable. Think of them like dollars: one $1 bill equals another $1 bill. ERC-20 contracts implement a standard interface: balanceOf (check balance), transfer (send tokens), approve (allow someone else to spend), and transferFrom (spend approved tokens). Exchanges, wallets, and DeFi protocols understand ERC-20 because the interface is standardized. Deploy an ERC-20 contract and it automatically works on OpenSea, Uniswap, MetaMask—no integration needed.