Podcasts are a series of audio or video files that are released episodically and can be played on MP3 players. They first emerged around 2003-2004 and have since been used by companies and individuals to distribute talk shows, music, sports updates, tutorials and other content. Creating a podcast involves recording audio or video on a computer, editing the files, uploading them to a web server, and embedding the podcast files on blogs or websites so others can subscribe and listen.