Who populates the ViewModel in ASP MVC 5

Expanding upon Tommy's answer, here is some code to go along with his description.

//Controller

public ActionResult Index()
{
  List<OrderViewModel>() model = new List<OrderViewModel>();  
  model = new ServiceClass().GetOrders();

  return View(model);
}

//here is your Service Class, this layer transfers the Domain Model into your ViewModel
public List<OrderViewModel> GetOrders()
{
   List<OrderDomain> model = new List<OrderDomain>();

   model = new DataAccess().GetOrders();

   List<OrderViewModel> viewModel = new List<OrderViewModel>();

   foreach (var order in model)
   {
        OrderViewModel vm = new OrderViewModel();
        vm.OrderId = order.OrderId;
        vm.OrderName = order.OrderName;

        viewModel.Add(vm);
   }      

    return viewModel;        
}

//some DataAccess class, this class is used for database access

Public List<OrderDomain> GetOrders()
{
     List<OrderDomain> model = new List<OrderDomain>();

      using (var context = new MyEntities())
      {
          model = (from x in context.Order
                   select new OrderDomain
                   {
                     OrderId = x.OrderId,
                     OrderName = x.OrderName
                   }).ToList();                     
      }
   return model;
}

Edit: This seems to be a mildly popular answer so I would like to mention I no longer follow this pattern. Instead I've been using mediatr and vertical slice architecture.