Overview

A connector is an electromechanical device that joins electrical conductors to make a temporary or permanent circuit. Connectors provide a controlled path for current or signals and are used where circuits must be connected, disconnected, or routed between devices. For a general definition see the electrical connector concept and standards used in industry.

Characteristics and components

Most connectors have a plug (male) and a receptacle or socket (female). Key parts include contacts (pins or sockets), an insulating body, an outer shell or housing, and sometimes seals, latches or locks to secure the connection. Important performance parameters are current and voltage ratings, contact resistance, insulation resistance, mechanical durability (mating cycles), environmental protection (IP ratings) and, for high‑frequency applications, impedance and shielding.

Types and examples

Connectors vary by function: power, signal, data, coaxial/RF and fiber. Common consumer and professional examples include:

  • RCA connector — widely used for analog audio and composite video.
  • XLR connector — a standard for balanced audio and microphones.
  • Phone connector — refers to audio jacks such as 1/4" and 3.5mm plugs used for headphones and instruments.

Other families include USB, HDMI, Ethernet (RJ), BNC/SMA for RF, and specialized board‑to‑board or wire‑to‑board headers used in electronics.

History and development

Connectors evolved alongside telegraph, telephone and radio technologies to allow modular equipment and easier maintenance. Over the 20th century standardized families were developed to ensure interoperability across manufacturers and industries; engineering improvements have focused on miniaturization, higher data rates, environmental sealing and safety.

Uses, safety and notable distinctions

Connectors are essential in consumer electronics, telecommunications, automotive, aerospace, industrial controls and medical devices. Design choices balance electrical needs (current, signal integrity), mechanical retention, user ergonomics and safety standards. Some connectors are genderless or keyed to prevent mismatches; RF connectors require impedance matching to avoid reflections. Proper selection and installation affect reliability and safety, so industry standards and certified components are often required for critical applications.