Azure Cosmos DB vs Azure SQL Database: What are the differences?
What is Azure Cosmos DB? A fully-managed, globally distributed NoSQL database service. Azure DocumentDB is a fully managed NoSQL database service built for fast and predictable performance, high availability, elastic scaling, global distribution, and ease of development.
What is Azure SQL Database? Managed, intelligent SQL in the cloud. It is the intelligent, scalable, cloud database service that provides the broadest SQL Server engine compatibility and up to a 212% return on investment. It is a database service that can quickly and efficiently scale to meet demand, is automatically highly available, and supports a variety of third party software.
Azure Cosmos DB can be classified as a tool in the "NoSQL Database as a Service" category, while Azure SQL Database is grouped under "Databases".