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In computer terms, Blu-ray is a high-capacity optical disc format designed to store high-definition video and other data, offering significantly more storage than DVDs due to its use of a blue-violet laser. A Blu-ray disc has the same physical dimensions as a DVD but uses a shorter-wavelength blue laser to read and write data at higher density, enabling higher video resolutions and larger storage capacities, with standard single-layer discs holding about 25 GB and dual-layer discs holding about 50 GB.

How it Works:

Blue Laser: Unlike DVDs that use a red laser, Blu-ray discs use a blue-violet laser with a shorter wavelength. This allows for a more precise beam that can read data from smaller, more tightly packed grooves on the disc's surface.

Higher Density: The higher precision of the blue laser enables data to be stored at a much higher density, meaning more information can fit on a single disc compared to a DVD.

Optical Disc: Like CDs and DVDs, Blu-ray discs are optical discs that store data in a series of pits and lands on the disc's surface, which are read by a laser.