Blockchain is a revolutionary technology that enables secure, transparent, and decentralized transactions. It operates as a distributed ledger system, where transactions are recorded across a network of computers in a tamper-resistant manner. Each transaction is verified by network participants, removing the need for intermediaries and enhancing trust. Blockchain's key features include immutability, transparency, and decentralization, making it applicable in various sectors such as finance, supply chain management, healthcare, and more. Despite its potential, challenges such as scalability and regulatory concerns remain, but blockchain continues to pave the way for a more secure and efficient digital future.