Blu-ray Disc (also known as Blu-ray or BD) is an optical disk storage media format designed to supersede the standard DVD format. The name Blu-ray Disc is derived from the blue-violet laser used to read and write this type of disc.
Its main uses are for storing high-definition video, PlayStation 3 video games, and other data, with up to 25 GB per single layered, and 50 GB per dual layered disc. Although these numbers represent the standard storage for Blu-Ray drives, the specification is open-ended, with the upper theoretical storage limit left unclear. The disc has the same physical dimensions as standard DVDs and CDs.