The Relational Database Service (RDS) is compatible with the following engines and acts as a drop in replacement for the following engines:

• PostgreSQL
• MariaDB
• MySQL
• Oracle Database
• Microsoft SQL Server

RDS provides its own database engine called Amazon Aurora, which is an AWS product designed to be compatible with engines like MySQL and PostgreSQL.  

RDS is a great choice to migrate and integrate existing applications in the cloud. RDS is designed to scale vertically and horizontally to support any kind of relational workload. RDS is engineered to provide an SLA of 99.95%.