Azure: Cosmos DB vs Document DB

Azure Cosmos DB is the globally distributed, multi-model database service for building planet scale apps. You can easily build globally-distributed applications without the hassle of complex, multiple-datacenter configurations. Cosmos DB automatically replicates all of your data to any number of regions of your choice, for fast, responsive access. Cosmos DB guarantees 99.99% high availability.

Only Cosmos DB allows you to use key-value, graph, and document data in one service.

 

One of the APIs Azure Cosmos DB supports is the SQL (DocumentDB) API.

That means Document DB service is now part of Cosmos DB services. Cosmos DB also allows you to use your favorite API like JavaScriptGremlinMongoDB, and Azure Table storage to query your data.

https://azure.microsoft.com/en-in/blog/dear-documentdb-customers-welcome-to-azure-cosmos-db/ is a good link to read further.

 

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