A parallel circuit is an electrical circuit where multiple components are connected across the same voltage source. This means that each component, such as light bulbs or resistors, has its own direct path to the power source. If one component fails or is removed, the others continue to operate because they are not dependent on a single path for current flow. In a parallel circuit, the total current is the sum of the currents through each component. The voltage across each component remains the same, which allows for consistent performance. This design is commonly used in household wiring, ensuring that if one light goes out, the others remain lit.