The first ideas that might come to your mind may be problems, conflicts, puzzles or other unanswered investigations that have no conclusions. Usually a mystery is defined as an unanswered question, or something not understandable. This means that there is no evidence to support an idea.
Mysteries exist everywhere.
Movies, media, novels, religion, and Mother Nature are all forms of unexplained conflicts that we have around us in everyday life. These are theories and beliefs that have good reasoning behind them, but little evidence to back them up. Usually a mystery is based upon facts that may occur, but have no reason or explanation for happening. Many people believe that UFO s for example, are alien life forms that live other places in the universe. Some people even have flying saucers caught on home video to prove their theories about aliens are correct.