Blockchain is a type of distributed database that is decentralized and allows multiple users to securely store and access data. Traditional databases, on the other hand, are typically centralized and controlled by a single entity. This means that with a traditional database, only a single user or organization has the ability to access and make changes to the data, while with a blockchain, multiple users can access and make changes to the data in a secure and transparent manner. Additionally, because of the decentralized nature of blockchain, it is typically considered to be more secure and resistant to tampering than traditional databases.