What types of databases have you worked with in cloud RDS?

When working with the Amazon RDS cloud service, I encountered various types of databases:

• PostgreSQL — for projects requiring advanced SQL capabilities and support for complex data types.
• MySQL — for classic web applications with high load and a large community.
• MariaDB — as a fork of MySQL with additional features and improvements.

Each type of database was chosen depending on the project requirements, for example, PostgreSQL for analytics and complex queries, MySQL for simple CRUD applications.