Answer:
So there are Empty Calories and Nutritional Calories - or regular calories. Empty calories basically are full of calories but don't really provide any help toward your body. They give you sugars and stuff your body doesn't really need and too much can bring damage to your body... basically junk food. Empty Calories are also usually burnt faster and more easily so your body will want to eat more.
Nutritional Calories are the opposite. You would be getting more nutrients (good stuff) and fewer calories. They burn wayyy slower and so you will feel full for longer and usually contain vitamins and fiber. These are usually used to eat better and lose weight(or maintain weight).
IK it is a lot but I hope that helped. Have a good day!!