A webisode is an episode of a series that is distributed as web television. It is available as either for download or in streaming, as opposed to first airing on broadcast or cable television. The format can be used as a preview, a promotion, as part of a collection of shorts, or a commercial. A webisode may or may not have been broadcast on TV. What defines it is its online distribution on the web, or through video-sharing web sites such as Vimeo or YouTube.