Connectors, also called plug-ins, are electronic components used to connect electrical appliances, mainly used for power or signal transmission, and are widely used in industry and life.

Connectors generally consist of external connectors and internal terminals. Connectors are generally insulators, and materials like plastics are divided into male and female ends, which are connected and fixed. The terminals are conductors that transmit signals or power, and many of them are plated, such as tin plating, gold/silver plating, etc., which play the role of conduction.