A closed-circuit system is a type of electrical circuit where the current flows in a complete loop. This means that the circuit has no breaks, allowing electricity to continuously travel from the power source, through the components, and back to the source. Closed-circuit systems are commonly used in various applications, including lighting, appliances, and electronic devices. In contrast to open circuits, which have gaps that prevent current flow, closed circuits ensure that all components receive power. This reliability makes closed-circuit systems essential for surveillance cameras, television broadcasts, and other technologies that require consistent operation.