aws cloud databases rdbms nosql graph
There are several types of database services in AWS like:
Relational Databases:
RDS Aurora Relational Database on EC2
Non Relational databases
Also you can have other types of NoSQL databases like DynamoDB Elasticache also used as cache for RDS
Other database types
Amazon Neptune Graph database service (Like Neo4j) Amazon KeySpaces a managed Apache Cassandra compatible (wide column) QLDB for Quantum databases Redshift Datawareahouse