AWS Certified Cloud Practitioner

Amazon DynamoDB is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability. It is specifically designed as a key-value and document database.

Key characteristics of DynamoDB:

• Key-value store: Data is stored as items (values) identified by a primary key
• NoSQL database: Does not use the relational model
• Serverless: Automatically scales based on workload
• Managed service: AWS handles infrastructure management, patching, and backups

Why other options are incorrect:

• In-memory: While DynamoDB can use in-memory caching through DAX (DynamoDB Accelerator), it is not primarily an in-memory database
• Relational: This describes traditional SQL databases like Amazon RDS, which use tables with fixed schemas and relationships
• Graph: This describes databases like Amazon Neptune that are optimized for storing and querying relationships between data points