A lucid dream is a dream in which you know you are dreaming. Typically this happens when the dreamer experiences something strange, and when they stop to question their reality, they realize they are in a dream. Lucid dreams happen naturally on occasion, although some people may have them naturally more often than others. The definition of lucid dreaming may be simple, but there are a lot of misconceptions surrounding it.
There is some confusion about the difference between lucidity and dream control. The two are related, but one can happen without the other. For example, many lucid dreamers experience little or no control in some dreams. On the other hand, it is possible to exercise some dream control without being aware that it is a dream. Typically the dream plot will explain this by making the dreamer believe that they have some sort of god-like power over everything. Dream control, by our definition, can be either conscious or unconscious.