DynamoDB is a popular NoSQL database service offered by AWS, primarily marketed towards mid-sized and large enterprises with flexible data models, reliable performance, and automatic scaling of throughput capacity. Its pricing model charges for data storage, writes, and reads based on GBs consumed, Write Capacity Units, and Read Capacity Units, with additional costs for provisioned throughput, reserved capacity, indexed data storage, caching, global tables, on-demand backup, continuous backups, point-in-time recovery, restoring a table, and streams. DynamoDB has recently introduced support for ACID transactions, but with restrictions. The service can become expensive quickly due to its high scalability needs, especially for fast-growing applications requiring low latency and geo-distribution. Alternative databases like YugaByte DB offer cost-effective solutions with similar features and functionality, allowing users to save over 10 times compared to DynamoDB.