A metal detector is an electronic device used to find metal objects buried underground or hidden in other materials. It works by generating a magnetic field and detecting changes in that field caused by metal objects. Metal detectors are commonly used in various fields, including archaeology, security, and treasure hunting. These devices come in different types, such as handheld models and larger, more advanced systems. They can locate items like coins, jewelry, and even historical artifacts. Many hobbyists enjoy using metal detectors to search for lost treasures, while professionals may use them for archaeological digs or security screenings.