A blu-ray disc player is a “optical disc” information storage device, similar to Compact Discs and DVDs, except with better performance and more storage capacity. The CD is considered a first-generation optical disc, the DVD is a second-generation optical disc and a blu-ray disc is considered a third-generation optical disc.
A blue-ray disc is called optical discs because information is stored on the tiny ridges of a disc and is accessed with a blue laser beam. “Blu-ray” specifically refers to the blue laser “ray” that is aimed at the blue-ray disc from the blu-ray player. The blue-ray player has a laser diode.
Why is Blu-Ray Better Than A DVD?
So you might be asking yourself, “What is a blu-ray disc player and why is blue-ray better than a DVD?” Blu-ray discs store more information than DVDs or CDs, because the information is stored closer to the edge of the optical disc. Blu-ray lasers use a shorter wavelength than the standard red or infrared lasers used for DVDs. A shorter wavelength means a more intense beam, and therefore it can be pinpointed more, which allows more surface space to store more information.
Blue-Ray vs High Definition (HD)
When comparing blue-ray vs high definition (HD) there’s not much evidence that blu-ray is better. Blu-ray disc players had a better marketing and distribution strategy than their high-def competitors. So when the two high-definition optical storage discs went up against one another, blu-ray had a few marketing advantages over its high-definition rival.