A circuit is a closed loop that allows electricity to flow. It consists of various components, such as wires, resistors, and capacitors, which work together to control the flow of electric current. When the circuit is complete, electricity can travel from a power source, like a battery, to a device, such as a light bulb, enabling it to function. Circuits can be classified into two main types: series circuits and parallel circuits. In a series circuit, all components are connected in a single path, so if one part fails, the entire circuit stops working. In a parallel circuit, components are connected across multiple paths, allowing electricity to flow even if one path is interrupted.