What is an electric circuit? Distinguish between an open and a closed circuit

What is an electric circuit? Distinguish between an open and a closed circuit.

An electric circuit consists of electric devices (bulb, fan, etc.), switching devices (key, fuse, etc.), and source of electricity (electric cell, battery, etc.) These are connected by conducting wires. An open circuit is an incomplete circuit and current does not flow though it, while a closed circuit is a complete circuit and current flows through it.