The RJ25 is an 6-position, 6-contact ($\text{6P6C}$) male modular plug designed to provide a reliable, secure connection for specific data and telecommunications applications. It is physically similar to the $\text{RJ11}$ and $\text{RJ12}$ plugs, but the RJ25 designation specifically implies all six contacts are present and used. The plug features a compact, clear plastic body and six metallic contacts that pierce the insulation and establish electrical contact with the six individual wires (three twisted pairs) within a compatible cable.

This plug is commonly used for connecting telephone equipment, such as line cords to telephones or PBX systems, and in some older or proprietary low-speed data or control applications. It terminates the cable in a straight-through or crossover configuration and uses a flexible locking tab to snap securely into the mating female jack.