Which AWS service is a relational database compatible with MySQL and PostgreSQL?

Explanations:

Amazon Redshift is a data warehouse solution, primarily used for analytical queries, not as a relational database.

Amazon DynamoDB is a NoSQL database service, not a relational database compatible with MySQL or PostgreSQL.

Amazon Aurora is a relational database service compatible with both MySQL and PostgreSQL.

Amazon Neptune is a graph database service, not a relational database compatible with MySQL or PostgreSQL.