Think of the Bitcoin network as a giant library. The blockchain is the master book where every transaction is written. Nodes are like librarians—they keep a copy of the book, check every entry for accuracy, and ensure nothing is out of place. Miners are the writers—they bundle new transactions into pages (blocks), solve a puzzle to add the page to the book, and then share it with all the librarians. Together, nodes and miners ensure the book is accurate, secure, and up to date for everyone. That’s how Bitcoin stays decentralized and trustworthy.