What kind of cactus do I have?

are the leaves thick or thin like a regular plant. if they are thick it sounds like you have a succulent (type of plant) they are similar to cactuses but not cactus. are the leaves thin like a regular plant then i dont know. if it is a succulent treat it like a cactus, in other words, they like light but to much water will kill them, they need very little water. if its a regular plant, usually indirect light is best, again not to much water, but dont let the soil dry out completely, some plants dont like a lot of sun so if it is in direct sunlight and not looking to good try less light, and dont overwater as this causes the roots to rot. i woudln't worry about repotting it as they have small roots (if you do, use a soil for cactus, never a soil that has water holding additives like peat), unless it is just way to big for the pot, putting a plant in a pot to big for it actually isnt good because the roots dont grow as strong(outdoor plants have the wind to strengthen them), just keep it out of direct all day sunlight( but does get sun), dont water to much, but dont let it dry out either, and they grow slowly so repotting isnt a big issue. ive had four aloe veras(another kind of succulent) growing in the same pot for almost three years now and they look fine. they are a little tricky to grow but to me no other plant looks as good as a well grown succulent.` good luck (oh yea, the best way to repot is moisten the soil top to bottom, turn the pot upside down and carefully shake it, the whole thing dirt and all should fall out, set in your new pot, and add the new soil around the edge. space the bottom of the pot with a layer of dirt if its deeper than the other so the plant sits at the same level, dont cover any of the stem with dirt.)