Often times you can make out the jagged edges, and enough aliasing can be distracting in games or movies. Your screen is made of a grid of pixels, so rendering a diagonal line actually means rendering steps. Anti Aliasing is a method of making edges on the screen appear less jagged.OpenGL had 2x-8x MSAA (Multi-Sample Anti-Aliasing) and 4x SSAA (Super Sample Anti-Aliasing), as totally arbitrary but at least easy to understand options. Anti-aliasing in Dolphin has always been less than optimal.
