Amazon RDS (Relational Database Service) is a fully manageable and scalable environment for relational database engines such as Amazon Aurora, PostgreSQL, MySQL, MariaDB, Oracle and Microsoft SQL Server. Developers don't have to worry about configuration, scaling, updating and security of database servers - these tasks are fully handled by the AWS layer. Database instances are fully customizable and backups are completely automated. RDS is an irreplaceable element in the stack of any application that uses relational databases.