A voice-over is the unseen person who narrates; that could be in a commercial, a documentary or even in fiction. Find out more about voice-overs here, in 60 seconds. http://photography.tutsplus.com/tutorials/voice-overs-in-60-seconds--cms-25227?utm_campaign=yt_tutsplus_2ClsI0All_U&utm_medium=referral&utm_source=youtube.com&utm_content=description