A standard box spring is the one you probably already have. On average this box spring is about 9 inches tall and is usually the same height as your mattress. These box springs will make your bed higher.
A low-profile box spring is 5-6 inches high and makes it easier to get into a bed that is tall. Low-profile box springs typically cost about the same as the standard ones.
If you are buying a new bed and mattress set, check with the sales representative for measurements regarding how tall your bed is. This will help you make the right decision when you purchase.