There are two main types of projectors - long throw and short throw. A long throw projector is used for long distances and covers a large area, contains HD for high definition images, and can have its light bulb inverted to prevent shadows on the screen. It connects via VGA or USB cables. A matrox allows using multiple projectors at once to divide the image across up to three projectors for larger screens or multiple simultaneous displays. QLab is software used to easily upload and edit videos, such as adding music or effects, making it convenient for basic video editing needs.