DynamoDB is a fully managed NoSQL database service provided by Amazon Web Services (AWS). It is designed to handle large amounts of data and offers high availability, scalability, and low-latency performance. Users can store and retrieve any amount of data, and it automatically scales to accommodate traffic patterns. With DynamoDB, developers can create applications that require consistent, single-digit millisecond response times. The service supports both document and key-value data models, making it flexible for various use cases. Additionally, it integrates seamlessly with other AWS services, enhancing its functionality and ease of use.