Is there a database in blockchain?

Blockchain is stored on all the computers running Bitcoin node . There are thousands of computers running full node. Each of these node record every new transaction in the blockchain. All of these nodes run as backup for the blockchain.

Unlike bank transactions, Bitcoin transactions are digitally signed and irreversible, and are stored in a peer-to-peer network of nodes (running Bitcoin Core) using the Bitcoin protocol (Antonopoulos, 2017).

While blockchains can be considered a database, a database is typically not a blockchain . Databases generally don’t use signed blocks to store the data. The blockchain structure makes it virtually impossible for someone to change the data without breaking the chain.