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An optical drive is a computer hardware. With an optical drive you can play CD's, DVD's or Blue-ray discs. Mostly optical drives can wrote data to a CD, or DVD.So you can copy music, photos or videos on a disc you for example. An ODD (optical disc drive) use a laser light to read or write data to a disk. Most modern drives allow you to write to an empty disc so you can create your own music CDs or create a back-up copy of important data. A laser in this context means an electromagnetic wave with a very specific wavelength within or near the visible light spectrum. This allows you to play music or watch movies using pre-recorded discs. Computer software also often comes on one of these discs so you need an optical drive to install software. Most modern drives allow you to write to an empty disc so you can create your own music CDs or create a back-up copy of important data.