Distance education is defined as a formal educational process where the majority of instruction occurs when the student and instructor are not in the same place. It may use correspondence study, audio, video, or computer technologies. Distance education dates back to the 1700s but saw more development with advancements in instructional media and technology in the early 20th century. By the late 20th century, over 80% of off-campus instruction incorporated telecommunications technologies, and virtual learning environments further facilitated distance learning management.