A wall plug is an electrical device that allows for the connection of electrical appliances or devices to a power source. It typically consists of a plastic or metal casing with two or three metal prongs that fit into a corresponding electrical outlet. When inserted into the wall socket, the plug establishes a secure electrical connection, enabling the flow of electricity to the connected device. The plug serves as a crucial intermediary between the power grid and various electrical devices, providing a safe and convenient means of accessing electrical power.