Blockchain is a decentralized digital ledger technology that securely records transactions across a network of computers in a way that is transparent, tamper-proof, and immutable. Instead of relying on a single central authority (like a bank or government), blockchain distributes data across multiple nodes, ensuring that every participant has a synchronized and verified copy of the ledger.

Each record, or “block,” contains a set of transactions that are linked (or “chained”) together using cryptography. Once added, these blocks cannot be altered without consensus from the network, making the system highly secure and trustworthy.

Blockchain is the foundation of cryptocurrencies (like Bitcoin and Ethereum) but extends far beyond powering innovations in finance, supply chain management, healthcare, education, and digital identity verification.

In essence, blockchain enables secure, transparent, and efficient peer-to-peer transactions, transforming how information and value are exchanged in the digital world.