Blockchain is a special data storage technology that connects data in blocks, recording every transaction like a ledger. This data is protected by cryptography, and once written into the blockchain, it cannot be altered, ensuring the security and credibility of the data.

You can think of a blockchain as a 'collectively maintained Google Doc'. It doesn't rely on a single institution for updates. Instead, everyone has a complete copy, and all transactions are public and transparent. When a new transaction occurs, participants in the network collectively verify and update the data, keeping the entire system consistent.

The reason Bitcoin needs blockchain is to solve a key problem: how to enable secure transfers of digital currency without a bank or third party, and prevent it from being double-spent? Blockchain provides the solution. Every Bitcoin transaction is recorded on the blockchain and verified by the entire network, ensuring that the transaction is authentic and cannot be forged.

In summary, blockchain is the foundation on which Bitcoin operates, much like roads are the foundation for cars. With it, Bitcoin can truly achieve decentralized, trust-transparent value transfer. For beginners, understanding blockchain is the first step to understanding the entire crypto world. Remember, if you're starting to engage with these technologies, choosing a legal, secure, and regulated platform is crucial to ensure the safety of your assets.

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