Cosmos DB storage is the premium offering for Azure Table storage. It's a multimodel and globally distributed database service that is designed to horizontally scale and replicate your data to any number of Azure regions. By replicating and scaling the data, Cosmos DB can guarantee low latency, high availability, and high performance anywhere in the world. You can replicate or scale data easily inside the Azure portal by selecting the available regions on the map.
This high availability and low latency makes Cosmos DB most suitable for mobile applications, games, and applications that need to be globally distributed. The Azure portal also uses Cosmos DB for data storage. Cosmos DB is completely schemaless, and you can use a number of existing APIs with available SDKs to communicate with it. So, if you are using a specific API for your data and you want to move your data to Cosmos DB, all you need to do is change the connection string inside your application...