The two main types of projector screens are rolling screens and stretch screens.
A rolling projector screen is more or less like a set of blinds. You simply attach it to the wall and pull it down when you want to watch something. It’s definitely the more affordable solution, as well as being elegant in the sense that it’s very easy to move around.
Alternatively, a stretch screen is placed on the wall - much like a painting - and typically affords you a better picture quality with very few folds in the actual screen. Unfortunately, these are not nearly as easy to move around and can’t be hidden away as a rolling projector screen can.