ABIs and Bytecode

Bytecode

ABIs

In Ethereum, an ABI (Application Binary Interface) is a standardized way for interacting with smart contracts. It defines how data should be encoded and decoded when being sent to and from a contract on the Ethereum blockchain.

Simple Solidity contract

GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract Sum {
    function sum(uint a, uint b) public pure returns (uint) {
        return a + b;
    }
}

Corresponding ABI

[
  {
    "inputs": [
      {
        "internalType": "uint256",
        "name": "a",
        "type": "uint256"
      },
      {
        "internalType": "uint256",
        "name": "b",
        "type": "uint256"
      }
    ],
    "name": "sum",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "pure",
    "type": "function"
  }
]

Try creating your own at https://remix.ethereum.org/