DynamoDB is an AWS managed NoSQL database service that provides fast and predictable performance with seamless scalability. It enables storage of large amounts of data, allowing it to be used for a wide range of applications including web, mobile, gaming and IoT. DynamoDB offers built-in support for ACID transactions and automatically replicates data across multiple Availability Zones (AZs). It also supports global tables which can replicate data into multiple regions in real-time. Additionally, DynamoDB has advanced security features such as encryption at rest and integrated support for fine-grained access control. All these features make DynamoDB ideal for powering mission critical applications with high performance requirements.