# Amazon Quantum Ledger Database
#aws #cloud #databases
Amazon QLDB is a fully managed ledger database that provides a transparent, immutable, and cryptographically verifiable transaction log in AWS.
- Amazon QLDB has a built-in immutable journal that stores an accurate and sequenced entry of every data change
- The journal is append-only, meaning that data can only be added to a journal, and it cannot be overwritten or deleted
- Amazon QLDB uses cryptography to create a concise summary of your change history
- Generated using a cryptographic hash function (SHA-256)
- Serverless and offers automatic scalability