Etherscan

A block explorer that lets you see transactions, wallets, gas fees and other aspects of Ethereum's blockchain. It also provides various charts to visualize said data as well as a list for those who want to track specific activity on the network.

It is the main and most widely used block explorer for Ethereum and other EVM-compatible blockchains. Etherscan also allows for smart contract verification and direct interaction through injected web3 wallets