A block explorer is a visualization layer for a blockchain that acts like a “search engine” of a blockchain. You can use block explorers to diagnose transaction issues, research tokens built on top of different blockchains, and even do forensics to track transactions as they move from wallet to wallet.
A block explorer is also a good way to verify the “health” and “performance” of a blockchain. A well-developed block explorer should have all the metrics you need to determine if the blockchain is running correctly, what the traffic on the blockchain looks like, # of nodes on the network, what are the fees associated with transacting on the blockchain, as well as other useful metrics.
Checkout the Avalanche Explorer to view all activity on Avalanche.