As a verb, a webcast is the act of using the Internet to broadcast live or delayed audio and/or video transmissions. Similar to traditional television and radio broadcasts, a webcast is a one-way recording of a taped presentation. For example, a university may offer online courses in which the instructor offers a series of webcasts, (pre-recorded or live lectures). Users must have the appropriate multimedia application in order to view the webcast.
The term webcast is also used as a noun to describe the actual data transmission that results from using this kind of push technology.