Sony, among other vendors, co-developed an optical disc format known as Blu-Ray. It is so known because it uses a blue laser to read the optical information from the disk. Because of the wavelength of the laser, it is able to focus to a much smaller degree than a typical red laser. Because if this tighter and smaller focus, the pits etched on the disk are much smaller. As a result of the higher density of data, much more data can be placed onto a Blu-Ray disk as compared to a DVD disk.