A collection of visual images set to accompany and or reflect the lyrics or overall feeling of a song. Usually used as a visual marketing tool to further push sales of an artists song. Also considered mini-movies or short films driven by a musical track. All genres from Hip-Hop to rock use music videos.
Man did you see that B-Real video "Los Angeles" by Director Hugo V? It was one of the best visually stunning hip-hop music videos I have ever seen!
A video which is meant to be released with a single from a CD, in which the artist appears and sings/plays the song while other events occur. Music videos are notorious for containing incredibly large amounts of product placement, such as phones, drinks, perfumes, or websites (Plentyoffish is among the most infamous).
The music video for Lady Gaga's Telephone, Ke$ha's We R Who We R, and Britney Spears's Hold it Against Me all contain advertisements for plentyoffish.com