A Faraday cage is an enclosure made of conductive materials that blocks external electric fields. It works by redistributing electric charges on its surface, preventing electromagnetic radiation from penetrating inside. 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 lightning strikes or electromagnetic interference. They can be found in places like laboratories, data centers, and even vehicles, ensuring that devices remain safe from external electrical disturbances.