When online courses first began, the primary mode of delivery was through a two way audio-visual network. Then as well as now, many of the virtual study programs were mainly based on text documents, but multimedia technologies have become increasingly popular as well. These web-based delivery modes are used in order to expand access to programs and services that can be offered anytime and anywhere. The spectrum of teaching modes in virtual education includes courses based on hypertext, videos, audios, e-mails, and video conferencing. Teaching on the web through courseware such as WebCT and Blackboard are also used. See Virtual education.
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