Macromedia Flash is the most universally installed video player, but it is not as widely used as Quicktime or Windows Media Player. The reason may be that it is more cumbersome to convert an edited video to flv (the Flash video format). Once converted, the flv file also requires some additional steps to prepare it for playback on a website. The guarantee that a website visitor will be able to see the video without first having to download a player seems well worth the extra effort. Most online video formats have the ability to download a movie clip "progressively" (it starts playing once a certain percentage of the file has been downloaded). For more demanding situations, both Quicktime and Flash offer true "Streaming Video", where specialized and dedicated servers provide almost instantaneous playback.