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, musicians, and others to distribute talk shows, 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 files on websites or blogs so others can subscribe and listen.