What is the difference in sandpaper grit?

The difference in sandpaper grit refers to the roughness or fineness of the sandpaper. Coarser grits (such as P40 or P60) are suitable for faster sanding and removing larger imperfections, while finer grits (such as P120 or P240) are ideal for sanding paint and smoothing surfaces. Choose the grit based on the task you want to perform and the desired final result.