What is the purpose of having initializer class in DbContext ?

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MVC5

EF6.0

i have following structure in DbContext class. Since i am new to Entity Framework i cant understand what is the purpose of each. Can anyone please explain it. This class is in DataAccess layer in the project



public class RegisterDb : DbContext
{
public RegisterDb () : base(ConfigurationManager.ConnectionStrings[RegisterDb].ConnectionString)
{
}

public RegisterDb (string connectionString) : base(connectionString)
{
}

public DbSet <student> Student { get; set; }



public virtual IDbSet<t> DbSet<t> () where T : class
{
return Set<t>();
}

public virtual void Commit()
{
base.SaveChanges();
}

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
Database.SetInitializer<registerdb>(null);
}
}

internal class Initialiser : DropCreateDatabaseAlways<registerdb>
{
protected override void Seed(RegisterDb context)
{
context.SaveChanges();
}
}