Entities in Common Data Service

A Common Data Service Database is one instance of a Common Data Service which stores data in standard and custom structures which we call entities.

In other words Standard/Custom Structure that stores data = Entities (in CDS)

Formal: An entity is defined as a logical set of records used to store data.

Entities are similar to tables in a relational database, but with entities you can create many different fields around one topic (like having different rows of information under a sub-heading).

So you can create many different instances of a Common Data Service (create many different CDS databases) to host data for your solution. When you create a Common Data Service, the database by default automatically fills in some standard entities to store data. This is common across the board - but you can extend upon this to customise your database.