Relays & Switches are basic control components used in electronic systems to control circuit on/off and switch circuit paths. Their core functions include circuit on-off control, signal switching and electrical isolation. Relays can control high current/high voltage with small signals and support remote and automatic control, while switches realize on-off through manual, mechanical or inductive triggering. Common types include electromagnetic relays, solid-state relays (SSR), reed relays, as well as toggle switches, push-button switches, micro switches, rocker switches and proximity switches. They are widely used in industrial automation, automotive electronics, home appliances, power systems, communication equipment and other fields, serving as the core execution components for circuit safety control and automatic operation.