Amazon RDS vs Amazon DynamoDB

Amazon Relational Database Service (RDS) is a managed database service from AWS that supports MySQL, PostgreSQL, MariaDB, Oracle, SQL Server, and Db2 engines. It automates hardware provisioning, database setup, patching, and backups with options for Multi-AZ deployments and read replicas.

Amazon DynamoDB Fully managed NoSQL key-value and document database from AWS designed for single-digit millisecond latency at scale.