Ignis Fatuus is a Latin phrase that refers to a type of light phenomenon, also known as a "will-o'-the-wisp." This eerie and often mysterious light has many alternative names in different parts of the world, including "ghost light," "jack-o'-lantern," "spook light," "fairy light," and "hinkypunk." In some cultures, the phenomenon is associated with supernatural and mystical entities like faeries, ghosts, or spirits. Despite the various monikers, many agree that the odd and beguiling light can be found in marshy areas or swamps, and it often leaves onlookers with more questions than answers.