Blockchain technology is a digital system that securely records information across many computers. This means that once data is added, it cannot be easily changed or deleted, making it very trustworthy. Each piece of information, or "block," is linked to the previous one, forming a "chain." This structure helps prevent fraud and ensures transparency, as everyone involved can see the same data. One of the most famous uses of blockchain is in cryptocurrencies like Bitcoin. These digital currencies rely on blockchain to track transactions without needing a central authority, such as a bank. This decentralized approach allows for greater security and privacy for users.