Blu-ray Disc (also known as Blu-ray or BD) is an optical disc storage media format. Its main uses are high-definition video and data storage. The disc has the same dimensions as a standard DVD or CD.

The name Blu-ray Disc is derived from the blue laser used to read and write this type of disc. Because of its shorter wavelength (405 nm), substantially more data can be stored on a Blu-ray Disc than on the DVD format, which uses a red (650 nm) laser. A dual layer Blu-ray Disc can store 50 GB, almost six times the capacity of a dual layer DVD.

As of April 5, 2008, more than 530[3] Blu-ray Disc titles have been released in the United States.

During the high definition optical disc format war, Blu-ray Disc competed with the HD DVD format. On February 19, 2008, Toshiba the main company supporting HD DVD announced it would no longer develop, manufacture and market HD DVD players and recorders,[4] leading almost all other HD DVD supporters to follow suit, effectively naming Blu-ray the victor of the format war.