what is the context class in mvc

You can think of DbContext as the database connection and a set of tables, and DbSet as a representation of the tables themselves. The DbContext allows you to link your model properties (presumably using the Entity Framework) to your database with a connection string.

Later, when you wish to refer to a database in your controller to handle data, you reference the DbContext. For Example,

public class ProjectEntities: DbContext

{

public ProjectEntities()

:base("name=ProjectEntities")

{

}

public virtual DbSet Menus{ get; set; }

}

is referenced later in the controller like

var context = new ProjectEntities()

for more details check this

https://www.asp.net/mvc/overview/getting-started/getting-started-with-ef-using-mvc/creating-an-entity-framework-data-model-for-an-asp-net-mvc-application