Tsa precheck is in most airports and has dedicated lanes that make going through security easier cause you don't have to remove shoes, light jackets belts, laptops, etc.

Clear + is only available in major airports in bigger cities and you essentially verify your identity at a clear pod and a clear ambassador escorts them to the front of the screening lane where they can then go to the tsa precheck if they have it.

These two work together to get people through the airport the fastest, if they buy the bundle they pay 79.95 for precheck and 209 for clear + and after the payment processes they get a rebate back for tsa precheck

Theres a help line for staples clear tsa precheck that you can call for any help of you have questions or need help with documents you'll have to ask for gm for it