Modular connector jacks are standardized interface components commonly used for data and voice communication. Available in configurations such as RJ11, RJ45, and RJ25, they support Ethernet, telephone, and networking applications. These jacks are designed for PCB or panel mounting and offer secure, compact connections for twisted-pair cables. Widely used in telecom, IT, and industrial systems, modular jacks provide reliable signal transmission and easy integration in communication hardware.