A Lip dub is a type of video that combines lip synching and audio dubbing to make a music video. It is composed of filming individuals or a group of people lip synching while listening to a song or any recorded audio then dubbing over it in post editing with the original audio of the song. There is often some form of mobile audio device used such as an ipod. Often they look like simple music videos, although many involve a lot of preparation and are well produced. They have become popular with the advent of mass participatory video content sites like youtube. Tom Johnson, a technical writer who blogs about Web 2.0's effect on communication, describes a good lip dub as having the characteristics, or at least the appearance, of: Lip Dub Video Clip Captures Essence of the Web — Spontaneity, Authenticity, Participation, Fun, 5-June-2007, Tom Johnson

• spontaneity: "It appears as if someone thought up the idea on the spot, pulled out their personal video camera, and said hey everyone, let’s all lip sync this Flagpole Sitta song."
• authenticity: The people, production and situation appear real.
• participation: "The video doesn’t consist of one person’s spectacular lip sync, but that of a group, all participating together in this one spontaneous effort, which seems to communicate the attitude and mood of the song."
• fun: the people in the video are having a lot of fun.