Azure Cosmos DB supports schema-less data, which lets you build highly responsive and "Always On" applications to support constantly changing data.
For example, Tailwind Traders provides a public training portal that is used by customers across the globe to learn about the different tools that Tailwind Traders creates. Tailwind Traders developers maintain and update the data. The following illustration shows a sample Azure Cosmos DB database that's used to store data for the Tailwind Traders training portal website.
Azure Cosmos DB stores data in atom-record-sequence (ARS) format. The data is then abstracted and projected as an API, which you specify when you're creating your database. Your choices include SQL, MongoDB, Cassandra, Tables, and Gremlin. This level of flexibility means that as you migrate your company's databases to Azure Cosmos DB, your developers can stick with the API that they're the most comfortable with.