Podcasts are a series of digital media files, either audio or video, that are released episodically and downloaded through web syndication. They can be created using various podcasting software programs available for Windows, Mac, Linux or mobile devices. Podcasts are used by many groups including news companies, sports organizations, celebrities, governments, and entertainment channels focused on topics like comedy and food. Creating a podcast involves recording audio, adding metadata, publishing an RSS feed online and promoting the podcast to gain subscribers and regular listeners.