At its most basic level, distance learning takes place when a teacher and student(s) are separated by physical distance, and technology (i.e., voice, video, data, and print) is used to bridge the instructional gap. Distance education can provide adults with a second chance at a college education, reach those disadvantaged by limited time, distance or physical disability, and update the knowledge base of workers at their places of employment. Video is becoming more widely used as a technological option for the distance educator. A video camera can be used to record lectures for the purpose of producing a video library of lectures. Video cameras can also be used for real-time one-way or two-way video conferencing with two-way audio conferencing. Interactive audio or video conferencing can provide real time face-to-face (or voice-to-voice) interaction. This is also an excellent and cost-effective way to incorporate guest speakers and content experts.