What are complex types in Entity Framework?

Complex types are scalar properties that consist of different types of entities that enable the scalar elements to be organized within the required entities. Complex types do not include keys and thus exist independently. It cannot participate actively in the associations and do not have navigation properties. The properties of the complex type cannot be null. Scalar properties can be null of the complex objects.

A complex type cannot inherit anything from the other complex types. The complex type must be defined as the class. When DbContext.DetectChanges is called, Entity framework detects changes on an object of the complex type in the members.