Distance education has existed for centuries and traditionally involved acquiring knowledge through correspondence courses delivered by postal mail. Recent definitions focus on how advanced technology now allows immediate interaction between instructors and students. Distance education uses a variety of media like internet, video, audio, and combinations to improve communication. It can be synchronous, requiring students and instructors to engage at the same time, or asynchronous with flexible schedules. Different course formats provide varying levels of independence and interaction for students. Factors like technological reliability and institutional support affect distance education systems.