Blockchain is described as a publicly accessible distributed ledger, a piece of IT infrastructure that serves as a database for a continuously growing list of records called blocks. Each block contains data (such as transaction records) and is cryptographically linked to the previous one, creating a secure, immutable information chain. 🔐 Why is blockchain trustworthy? ❌ It cannot be altered retroactively ✅ All transactions are transparent and publicly verifiable 🌍 No central authority or middleman controls it