Blockchain is a digital ledger. No middlemen. Everyone has a copy. Transactions get grouped into blocks. Each block links to the previous one—chain.

Miners validate transactions (proof-of-work). Nodes keep it honest. Tamper-proof—change one block, you change all.

Smart contracts? Self-executing code. DeFi? Banking without banks. NFTs? Unique digital ownership.

Slow? Yes. Secure? Extremely. Future? Unstoppable.