The primary difference between a freezer vs a deep freezer is the capacity of each type of appliance. A traditional freezer holds up to 150 liters, whereas a deep freezer holds anywhere between 100 and 510 liters.
Another difference between a freezer and a deep freezer is the design of each. A regular freezer is usually attached to a refrigerator, either side by side or above or below it. A deep freezer is a stand-alone freezer that doesn't come with shelves or drawers.