Can you explain what a Set collection is in the context of Entity Framework?

In Entity Framework, the Set collection represents a set of entities of a specific type that can be worked with in the database context. It is like a table in the database, through which you can perform add, delete, update, and query operations.

For example, if you have an entity User, then context.Set<User>() returns a collection of all users that you can work with:

var users = context.Set<User>().Where(u => u.IsActive).ToList();

Thus, Set allows you to abstract away from specific tables and work with data through objects.