Resolution refers to the number of pixels per image. For projectors the most common resolutions are XGA (1024 x 768), WXGA (1280 x 800), WUXGA (1920 x 1200), Full HD (1920 x 1080) and 4K (4096 x 2160). The higher the resolution, the sharper the projected image would be. For most corporate and education projectors, XGA, WXGA and WUXGA projectors are used. Meanwhile home theatre projectors have resolutions of Full HD or 4K.