Cosmos DB is Microsoft's globally distributed (using a turnkey distribution), horizontally partitioned, multi-model database as a service. Cosmos DB allows its users to scale their database throughput and storage across 30 plus regions spread across the globe.

Cosmos DB is the first database as a service that offers service-level agreements for most throughput and low latency. Cosmos DB is designed to power multi-tenancy and scale.

In this chapter, we will cover the following topics:

• Cosmos DB data models
• Atom record sequence data model
• DocumentDB API
• MongoDB API
• Table API
• Graph API
• Consistency models

Let's begin!