A "Ghost Detector" is a device or application designed to identify paranormal activity, often associated with the presence of spirits or ghosts. These tools typically use various sensors to measure electromagnetic fields, temperature changes, and sound frequencies, which some believe can indicate ghostly presence. Many ghost detectors are used by paranormal investigators and enthusiasts during investigations in reportedly haunted locations. While the scientific community remains skeptical about the existence of ghosts, these devices continue to attract interest from those curious about the supernatural, often featured in popular culture, including movies and television shows about ghost hunting.