Distance education is education that takes place when the source of information and the learners are separated by physical distance, typically using the internet. It allows students to learn at their own pace without attending traditional in-person classes. There are three main models of distance education: correspondence which involves limited collaboration, multimedia which uses television and radio networks, and flexible learning which allows students worldwide to access materials at the same time through various technologies. Distance education has advantages like lower costs, flexibility, and the ability to learn from anywhere in the world, but also disadvantages such as lack of immediate feedback and social interaction compared to traditional classrooms.