The digital versatile disc (DVD) is a digital storage medium similar to a CD, but with a significantly larger storage capacity. This is possible thanks to the higher data density and two parallel data layers. The DVD is a further development of optical storage media. It is the third generation, following CD and the magneto-optical MiniDisc
The Blu-ray disc (BD) is a digital optical storage media. It is considered the victor in the format war between Blu-ray discs and HD DVDs.