Students who are not physically sitting in a class room to get their education are taught using technology based instructional systems designed for remote access. This system is known as distance learning or distance education. Students and teachers communicate with each other through printed materials or electronic media or using a technology that provides real-time communications. Distance learning uses regular mail for correspondence. Real-time or offline internet resources are also used in this system. Television or radio is used to make educational broadcasts to reach the students of distance learning. Isaac Pitman used the very first modern distance learning system in 1840 to teach shorthand through correspondence. Since 1946, correspondence courses in the distance-learning mode were offered by the University of South Africa, which is one of the oldest distance learning universities in the world. In UK, the Open University was founded in 1969. For-profit institutions, non-profit organizations, public and privates institutions are offering degree programs and courses in distance learning. There is varying level of accreditation for such institutions. Some of the institutions in USA have very little focus from the countries outside and some of them are mere diploma mills, which are mostly fraudulent. The distance-learning program was greatly benefited in the twentieth century by using Internet, television and radio. Even though the presence of a student is not compulsory in distance learning, with the advent of technology, physical presence or lack of it has become an option. In distance learning, electronic classrooms can be classified as off campus or on campus. It is known as institutions using a mode of delivery, which is flexible. Find more info at http://www.distance-learning4u.info In many cases, students do sit in traditional classrooms and they are connected to a teacher in a distant classroom through videoconference. This technology increases the...