Videocasting (or vodcasting) is a specialized form of podcast, delivering video clips on demand and distributed, like podcasts, through RSS or Atom feeds. Videocasts can be streamed or downloaded by the viewer. Some videocasting services are well known to the public – YouTube and Google Video, for example – but the available range of publishers is quite broad. Factors to consider include the required platform to produce, level of polish required, output formats and resolution (and consequent file sizes), and more. Video continues to evolve and is extremely popular and effective. The category also links to a site with a fine list of video production tools.