Blockchain is basically a shared digital ledger (like a public notebook) that records transactions in a way that’s:

Decentralized → No single person or company owns it; instead, it’s run by many computers (nodes).

Immutable → Once info is added, it can’t be easily changed or deleted.

Transparent → Everyone on the network can verify the transactions.

Each set of transactions gets grouped into a block, and those blocks are linked together in order → forming a chain of blocks → hence, blockchain.

Think of it as:

A Google Doc that everyone can see and update, but nobody can secretly alter the past edits.

Or like a receipt book where every page (block) is signed and chained to the last one, making it tamper-proof.

That’s why it’s the foundation for crypto, NFTs, DeFi, DAOs, and beyond—because you can trust the system without needing a middleman