Blockchain is a series of blocks that are connected to each other and contain information on certain transactions or activities. Blockchain is a technology that provides a decentralized ledger system, useful for recording and verifying transactions in a transparent and secure manner.

On a blockchain, all transactions that occur are recorded in new blocks that are added to the chain. Each block has a reference to the previous block, resulting in a chronological and immutable trail of transactions. The authenticity and integrity of data in a blockchain is guaranteed by strong cryptographic encryption.

Blockchain is unique because of its decentralized nature. There is no one central party or authority that controls or has full control over the blockchain. Blockchain enables transparency, security, and efficiency. With the potential for continued innovation, blockchain is expected to continue to have a positive impact in many sectors in the future.