What is Etherscan?

Etherscan is a blockchain explorer that allows you to view transaction history, smart contract code, and other information on the Ethereum blockchain.

How to use

• To use Etherscan, navigate to the website (https://etherscan.io/) and enter the address of the smart contract or wallet that you want to view information for.

Every Chain has its own "Etherscan" for mainnet and testnet, for example 
Polygon has https://polygonscan.com/

• You can view the transaction history, view the smart contract code and even see the analytics of the contract such as the number of transactions, holders and more.