Explanation
Depending on the choice of the API, an Azure Cosmos item can represent either a document in a collection, a row in a table or a node/edge in a graph. The following table shows the mapping between API-specific entities to an Azure Cosmos item:

An Azure Cosmos container is specialized into API-specific entities as follows:

References:
https://docs.microsoft.com/en-us/azure/cosmos-db/databases-containers-items