Web3 is a decentralized version of the internet that allows anyone to interact with smart contracts on a blockchain. Smart contracts are publicly verifiable computer programs running on a blockchain, and users can interact with these contracts without a web UI by using blockchain clients and command-line tools. Etherscan is a block explorer for various blockchain networks like Ethereum and Polygon, enabling users to interact with smart contracts. The article explains the process of verifying smart contracts on Etherscan, covering the deployment of a simple Solidity contract using Remix IDE, the importance of matching compiler versions, and the steps to verify the contract on Etherscan. Additionally, it discusses handling multiple Solidity files by flattening them and using the Etherscan plugin for contract verification. The article emphasizes that these processes facilitate broader interaction with deployed contracts and offers resources for further learning through Chainlink's community.