High Definition (High Def) video. This broad term covers everything from 1080i to 4.4.4. "What?" you ask. "Exactly," I answer. I have asked people whom I trust to tell me what all these crazy, incoherent terms mean. I have learned that no one on this planet currently knows a certain definition of HD. There are at least 3 levels/qualities that are all considered High Def, but that have tremendous varriance in their information "throughput" (Mbps). In short, HD is anything higher than MiniDV in video quality; in other words: It's good looking video.