A blockchain is a digital, decentralized ledger that records transactions on multiple computers. It is programmed to be secure, transparent, and highly resistant to modification. It is essentially a chain of blocks that contain information, and once data is recorded on a block, it cannot be altered. Each block is connected to the one before it, forming a chain of blocks, hence the name “blockchain.”
The main advantage of a blockchain is that it allows for a secure and transparent way to store and transfer data without the need for a central authority or third party. This makes it useful for a wide range of applications, such as tracking financial transactions, verifying the authenticity of documents, or securing supply chain information.
To sum it up, a blockchain is a digital record of transactions that is secured and verifiable, making it a reliable way to store and transfer data.