A block explorer works as a search engine that helps you explore and navigate a blockchain. In simple terms, it's a tool that allows you to view and track transactions, addresses, and other activities happening on a blockchain. You can think of it as a window into the blockchain world. With a block explorer, you can search for specific transactions by their unique ID, check the balance of a particular address, see the details of each block, and even explore the entire transaction history of a blockchain. It provides transparency and allows anyone to examine the transactions and activities occurring on the blockchain in a user-friendly way.