Indica, sativa and hybrid are all classifications for strains of cannabis, and they loosely describe the general effects that you can expect from a given product.
An indica cartridge will most likely result in a more “mellow” high, typically with a significant degree of relaxation and tiredness. The best indica cartridge will allow you to drift off slowly and wake up feeling refreshed and rested the next morning.
A sativa cartridge, on the other hand, is most often used during the day when you are looking for a more creative and productive high. It most likely will not make you drowsy, and it may uplift your energy level and focus.
Hybrid THC carts tend to produce a combination of the above effects, and some consider hybrids the best cannabis cartridges for daily use. They may, for example, allow your mind to relax while stimulating your appetite, or cause your appetite to decrease while giving you the ability to still think clearly.