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Blu-Ray is an optical storage medium technology similar to that of the DVD, except that it uses a blue-violet laser to read the disc rather than a standard red laser. Blu-Ray discs can hold up to 25 gigabytes of storage memory. Right now the PlayStation 3 is the only game system that uses Blu-Ray technology.
The first Blu-ray Disc prototypes were unveiled in October 2000, and the first prototype player was released in April 2003 in Japan. After that, it continued to be developed until its official release in June 2006.
The name Blu-ray Disc refers to the blue laser used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs.