VOIP (Voice Over Internet Protocol) allows users to make voice calls over a broadband internet connection instead of a traditional phone line. It has advantages like low cost for PC-to-PC, PC-to-phone, and monthly fee calling as well as portability. However, disadvantages include lack of service during power outages and reliability issues for emergency 911 calls. The document discusses uses of VOIP in distance education for students to participate in lectures, interact with tutors, submit assignments from their phones. VOIP can also help tutors track student progress, deliver lectures, and provide immediate feedback.