Imagine a shared Google Doc that thousands of people can read — but nobody can edit or delete past entries. Every time someone adds a new line, everyone's copy updates instantly, and the history is permanent. That's blockchain. Instead of one bank or company controlling your records, thousands of computers around the world each hold an identical copy. If someone tries to change one copy, it instantly conflicts with all the others — making fraud nearly impossible. No middleman. No single point of failure.
