Amazon's relational database compatible with MySQL and PostgreSQL is Amazon Aurora. It is a proprietary, cloud-native relational database engine offered through Amazon Web Services and integrated with Amazon RDS.
Aurora debuted in 2014 with MySQL compatibility. AWS added PostgreSQL compatibility in 2017, allowing applications and tools built for either database ecosystem to work with Aurora-compatible editions. Its architecture separates database compute from a distributed storage layer, helping AWS provide automated replication, backups, and fault-tolerance.
Amazon Aurora is often confused with Amazon RDS because Aurora is available as an RDS database option, but they are not identical names. RDS is the broader managed relational-database service supporting several engines. Redshift is designed for analytics, DynamoDB is a NoSQL database, and RDS is the service family rather than this specific Aurora engine.