Amazon DynamoDB is a managed NoSQL database service provided by Amazon Web Services (AWS). It is designed to provide high availability, scalability, and performance for applications that require fast and predictable performance with seamless scalability.

Key features of Amazon DynamoDB include:

1. Managed Service: DynamoDB is fully managed by AWS, which means AWS takes care of tasks such as hardware provisioning, software patching, setup, configuration, and backups. This allows developers to focus on building applications rather than managing the database infrastructure.

2. NoSQL Database: DynamoDB is a NoSQL database, meaning it does not use a fixed schema and can handle semi-structured or unstructured data. It uses a flexible data model to store and retrieve data in the form of items, which are similar to rows in a traditional relational database.

3. High Availability and Durability: DynamoDB offers built-in data replication and automatic multi-data center synchronization, ensuring high availability and data durability. It replicates data across multiple Availability Zones within an AWS region.

4. Scalability: DynamoDB can handle large amounts of traffic and data. It offers automatic scaling based on the application's needs, and it can handle sudden spikes in traffic without manual intervention.

5. Predictable Performance: DynamoDB provides low-latency, predictable performance, with the ability to define read and write capacity units. It also supports on-demand capacity for unpredictable workloads.

6. Rich Query Capabilities: DynamoDB supports powerful querying capabilities with secondary indexes, allowing efficient retrieval of data using various attributes.

7. Security and Access Control: DynamoDB integrates with AWS Identity and Access Management (IAM) for access control and provides encryption at rest and in transit.

8. Integration with Other AWS Services: DynamoDB can be easily integrated with other AWS services, such as AWS Lambda, Amazon S3, Amazon Redshift, and more, to build comprehensive and scalable applications.

Amazon DynamoDB is commonly used for various applications, including web and mobile applications, gaming, IoT (Internet of Things), real-time analytics, and more, where high performance, scalability, and ease of management are important considerations.