Azure Cosmos DB is a database service provided by Microsoft's Azure a popular cloud computing platform and is globally distributed. It is a multi-model database service used by corporates and big tech companies to develop modern web and mobile-based applications. It is well-known and supports the document-based structure for storing data.

Functionally the Azure Cosmos DB stores the items in the form of containers.
This database provides great performance in real time because every field in each item is indexed by default without writing or making changes to the schema.

There are two types of indexes offered by Cosmos DB. They are:
1) Range
2) Spatial

Range:
Supports range with ORDER BY queries.

Spatial:
Supports spatial queries from points, polygons, line strings, and Geo JSON fragments.

Global distribution

Cosmos databases provided by Microsoft azure are distributed databases and can be configured to be available in any of the Microsoft Azure regions, this will enable developers to configure the application's data closer to where their end users are. Each container's data gets transparently replicated across all configured regions.

For features and use cases https://fsh.org.in/blog-details/Database/Microsoft+Azure+Cosmos+DB/27