Amazon RDS and Amazon Aurora are both managed AWS services that support the PostgreSQL database engine. Amazon RDS makes it easier to set up, operate, and scale PostgreSQL deployments on the cloud, while Amazon Aurora is a cloud-native database engine that is compatible with PostgreSQL and offers higher performance and availability. Amazon Athena is a serverless query service that does not support PostgreSQL, but can analyze data in Amazon S3 using standard SQL. Amazon EC2 is a compute service that allows users to launch virtual machines, but does not provide any database management features. Amazon DynamoDB is a NoSQL database service that is not compatible with PostgreSQL, but offers fast and consistent performance at any scale. References: Hosted PostgreSQL - Amazon RDS for PostgreSQL - AWS, Amazon RDS for PostgreSQL - Amazon Relational Database Service, AWS PostgreSQL: Managed or Self-Managed? - NetApp, AWS Announces Amazon Aurora Supports PostgreSQL 12 - InfoQ, Amazon Aurora vs PostgreSQL | What are the differences? - StackShare