Blockchain technology is a decentralized digital ledger that records transactions across multiple computers (nodes) in a transparent and secure manner. It uses cryptographic techniques to ensure the integrity and immutability of data.
Blockchains are typically used for storing and verifying transactions in cryptocurrencies like Bitcoin, but they have broader applications beyond digital currencies. They can be used for supply chain management, voting systems, smart contracts, decentralized applications (DApps) and more.