YouTube is a video sharing website created in 2005 that allows users to upload, view, and share videos using Adobe Flash or HTML5. DVDs offer higher storage than CDs while having the same dimensions, and can be recorded once or multiple times depending on the type of DVD. CDs store digital data and were adapted to also store audio, data, video, photos, games and more. Radio is the transmission of signals through free space using electromagnetic waves to carry audio frequencies.