RDS
In plain terms
Amazon's managed relational database service.
Going deeper
RDS runs managed SQL databases (MySQL, PostgreSQL, etc.) handling backups, patching, and scaling for you. It removes database admin overhead.
Under the hood
Automated backups, Multi-AZ failover, and read replicas; you give up some low-level control for convenience.
Examples
Managed MySQL/PostgreSQL, web app backends, Multi-AZ, automated backups.
Think of it like...
Like renting a database with a maintenance crew handling upkeep for you.