From Wikipedia, the free encyclopedia:
Just Dance is a music video game developed and published by Ubisoft for the Wii. It was released on November 17, 2009 in North America, November 26 in Australia, and November 27 in Europe. It is similar to the Dance Dance Revolution games in which players use the Wii Remote and attempt to mimic the on-screen silhouette dancer. Players earn points depending on what moves they perform and how well they perform them.
Source: Wikipedia, "Just Dance," available under the CC-BY-SA License.