An electric circuit is a closed loop that allows electric current to flow. It typically consists of a power source, such as a battery, wires, and one or more components like resistors, capacitors, or light bulbs. When the circuit is complete, electricity can move through the wires, powering the components. Circuits can be classified as either series or parallel. In a series circuit, all components are connected in a single path, so the same current flows through each one. In a parallel circuit, components are connected across common points, allowing multiple paths for the current, which can improve reliability and performance.