Aspect ratio is the relationship between screen width and height. For example, 16:9 means the screen is 16 units wide for every 9 units high.

16:9 is the most common choice for home theater, streaming, sports, gaming, and general projector use. 2.35:1 is often used for dedicated movie rooms.

2.35:1 is a wide cinemascope format used for many movies. It creates a more cinematic look, especially in dedicated theater rooms.

4:3 is less common for home cinema today, but it can still be useful for classrooms, business presentations, and older projection systems.

Yes. The same diagonal size can have different widths and heights depending on the aspect ratio. A 120″ 16:9 screen is wider and shorter than a 120″ 4:3 screen.