Blockchain technology is a digital system that records information in a way that makes it difficult to change or hack. It consists of a chain of blocks, where each block contains a list of transactions. Once a block is filled, it is linked to the previous block, creating a secure and transparent record of all transactions. This technology is decentralized, meaning it is not controlled by a single entity, like a bank or government. Instead, it relies on a network of computers, known as nodes, to validate and store the information. This enhances security and trust among users.