1. AWS DynamoDB

• A NoSQL database service.
• Fully managed, serverless, scales automatically.
• Stores key-value and document data.
• Ideal for high-throughput applications like user profiles, e-commerce shopping carts, etc.
• Key Features:
  • Millisecond latency
  • Global tables (multi-region replication)
  • Backup and restore

2. AWS Lambda

• Serverless compute service.
• Run backend code without managing servers.
• Triggered by events (e.g., API Gateway request, DynamoDB changes, S3 upload).
• Pay only for the actual compute time used (milliseconds).

Typical Lambda example:

• Frontend sends a request → API Gateway triggers Lambda → Lambda writes to DynamoDB.

3. AWS RDS (Relational Database Service)

• Managed SQL database (supports MySQL, PostgreSQL, SQL Server, MariaDB, Oracle).
• Handles database provisioning, patching, backup, replication automatically.
• Great for apps needing structured data with SQL query capabilities.

Typical usage: