A web series is a series of episodes released on the Internet or also by mobile or cellular phone, and part of the newly emerging medium called web television. A single instance of a web series program is called an episode (the term webisode has been largely deprecated).
While the popularity of web serials is continuing to rise, the concept itself isn’t entirely new. Scott Zakarin created the first advertiser supported web series in 1995, The Spot. Homicide: Second Shift was a pioneering Internet web series that tied into the TV series Homicide: Life on the Street. The web series started in 1997 and was ultimately cancelled due to financial constraints and technological restrictions.
The rise in popularity of web series can be seen as a result of the increasing availability of broadband and the improved video streaming technology. This has allowed independent producers to create low budget series distributed on the Internet, but more recently major television production companies are using the Internet as a means of promoting their TV shows as well as developing specific media and shows for the Internet.