Blockchain technology is a decentralized, digital ledger that securely records transactions across many computers, ensuring data integrity and transparency without needing a central authority. Each block contains a cryptographic hash of the previous one, creating an immutable chain. This innovation has revolutionized industries by enabling secure, transparent, and efficient recordkeeping, from finance to supply chain management. Understanding its core principles  decentralization, cryptography, smart contracts  is crucial for harnessing blockchains potential in todays digital economy.