Distance education is teaching students who are not physically present in a traditional classroom setting. It focuses on delivery methods using technology to teach remotely. Early forms included print materials, audio/video cassettes, radio, and television. More advanced methods are teleconferencing using audio, graphics, video and computers. Computer-based instruction and web-based instruction are now common through programs and online resources. Distance education connects learners to educational materials using a variety of technologies across distances in real-time or asynchronously.