The advent of the Internet in the 1990s opened the door to big changes in distance education. It became relatively inexpensive to deliver sophisticated course content via the Internet. This became the advent of online education. In this mode, the courses are delivered primarily via the Internet to students at remote locations, including their homes. An online course may need that students and teachers meet once or periodically in a physical setting for lectures, labs, or exams, so long as the time spent in the physical setting does not exceed 25 percent of the total course time. This mode has become more accessible to the students as e-mail and chat allows easy communication among students and between students and the instructor. Web cameras provide the opportunity to enhance content with live or recorded images. The Internet also made the mechanics of online learning much easier to implement. Students are able to see their grades instantly. Instructors were able to make global changes to lectures and reading lists as needed. Students could take tests and quizzes online, and in some cases, receive grades right away.
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