A Faraday cage is an enclosure made of conductive materials that blocks external electric fields. It works by redistributing electric charges on its surface, which cancels out the electric field inside the cage. This principle is named after the scientist Michael Faraday, who discovered this effect in the 19th century. Faraday cages are used in various applications, such as protecting sensitive electronic equipment from electromagnetic interference and lightning strikes. They can be found in laboratories, vehicles, and even some buildings, ensuring that the internal environment remains unaffected by external electrical disturbances.