An electric circuit is a closed loop or pathway that allows electric current to flow. It consists of various components such as power sources (like batteries or generators), conductors (like wires), and loads (like light bulbs or motors). The circuit must be complete for the current to flow; if there's a break in the circuit, the current stops. This simple concept is the foundation of all electrical and electronic devices, enabling them to function by providing a controlled path for electricity to travel.