Amazon DynamoDB is a fully managed NoSQL database service provided by AWS. Key characteristics include:

• Serverless: No infrastructure management required
• High Performance: Single-digit millisecond latency at any scale
• Highly Available: 99.99% availability SLA with multi-AZ replication
• Flexible Schema: NoSQL document and key-value data models
• Auto Scaling: Automatically scales up/down based on traffic
• ACID Transactions: Support for transactions across multiple items
• Global Tables: Multi-region, multi-master replication