Fringe theories are ideas or hypotheses that exist outside the mainstream scientific consensus. They often lack substantial empirical support and are not widely accepted by the scientific community. Examples include theories related to UFOs, alternative medicine, or ancient aliens. While some fringe theories may spark interest or debate, they typically do not adhere to rigorous scientific methods. These theories can sometimes arise from a desire to explain phenomena that mainstream science has not fully addressed. However, they often rely on anecdotal evidence or personal beliefs rather than systematic research. As a result, fringe theories can lead to misinformation and confusion about established scientific knowledge.