Blockchain is a distributed and tamper-resistant digital ledger technology used to record transactions in a secure and transparent manner. Unlike traditional centralized systems, blockchain operates on a peer-to-peer network, where each participant has access to the same data, ensuring trust without the need for intermediaries. Each transaction is stored in a "block," which is linked to the previous one, forming a chain. This technology is widely used in cryptocurrencies like Bitcoin but is also transforming industries such as finance, healthcare, logistics, and education by improving data integrity and security.