Explore the resource hierarchy
The Azure Cosmos DB account is the fundamental unit of global distribution and high availability. Your Azure Cosmos DB account contains a unique Domain Name System (DNS) name and you can manage an account by using the Azure portal or the Azure CLI, or by using different language-specific SDKs. For globally distributing your data and throughput across multiple Azure regions, you can add and remove Azure regions to your account at any time.
Elements in an Azure Cosmos DB account
An Azure Cosmos DB container is the fundamental unit of scalability. You can virtually have an unlimited provisioned throughput (RU/s) and storage on a container. Azure Cosmos DB transparently partitions your container using the logical partition key that you specify in order to elastically scale your provisioned throughput and storage.
Currently, you can create a maximum of 50 Azure Cosmos DB accounts under an Azure subscription (can be increased via support request). After you create an account under your Azure subscription, you can manage the data in your account by creating databases, containers, and items.