What are the different paint gloss levels available for interior walls and how do they affect the overall appearance of a room?

The different paint gloss levels for interior walls are flat, eggshell, satin, semi-gloss, and high-gloss. These levels affect the appearance of a room by influencing how light is reflected off the walls. Flat paint has a matte finish and hides imperfections but can be harder to clean. Higher gloss levels like semi-gloss and high-gloss are more reflective and easier to clean, but they can highlight imperfections on the walls.