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A hoverboard is a fictitious skateboard-like vehicle seen in the films Back to the Future Part II and Back to the Future Part III. The main difference with a "modern, real" skateboard is that a hoverboard does not have or require wheels to operate, and floats in mid-air. In the movie, the hoverboard was invented before the year 2015.
Although director Robert Zemeckis once jokingly said during an interview that hoverboards were real, the principles for a working hoverboard are currently beyond our knowledge.