1. Relational Database
   1. AWS supported data engines
      1. MySQL
      2. PostgreSQL
      3. MariaDB
      4. Oracle
      5. MS MySQL Server
      6. Amazon Aurora
      7. AWS Relational Database Service (RDS)
      8. Licence
   2. HA with Multi-AZ
      1. For disaster recovery only
      2. Primary and secondary DB instance
2. NoSQL Database
   1. Key/value stores
   2. Document stores
   3. Scales horizontally
   4. Manage session state, user profiles, shopping cart data etc
   5. Amazon DynamoDB
3. Data Warehouses
   1. Amazon Redshift
4. Scale up and out
   1. Vertical Scalability
   2. Horizontal Scalability with Partitioning (sharding)
      1. NoSQL DB like DynamoDB is good for scaling horizontally
   3. Horizontal Scalability with Read Replicas
      1. scale out your read-intensive databases.
      2. Increased performance
      3. Supprts MySQL, PostgreSQL and Aurora