Amazon DynamoDB is a serverless NoSQL database service designed for building modern applications at any scale. With its serverless architecture, billed depending on usage, it automatically scales to zero, eliminating cold starts, version upgrades, maintenance windows, patching, and downtime. DynamoDB provides extensive security controls and compliance standards. For globally distributed applications, DynamoDB global tables offer a multi-region, multi-active database with a 99.999% availability SLA and enhanced resilience. It also supports managed backups, point-in-time recovery, and more for reliability. DynamoDB streams enable serverless, event-driven applications.