Block explorer

A blockchain explorer is a tool that lets users view and verify public blockchain data. It shows records such as transactions, blocks, wallet addresses, timestamps, and network fees, based on information written to a blockchain’s ledger. Explorers also display block-level details, including the block height, the transactions included in a block, and the identifier that links one block to the next. Because the data is public on most networks, explorers provide a way to reference specific transactions and confirm when they were added to the chain.
Example or use case

A user can paste a Bitcoin transaction ID into Blockchain.com Explorer or Mempool.space to verify whether the transaction has been confirmed, how many confirmations it has, and what network fee was paid.