9-pin D-sub (DB9) connector.
These connectors are commonly used for computer serial ports, legacy peripherals, networking devices (like Cisco routers for console access), and industrial equipment.
Connector Type: 9-pin D-subminiature (DB9).
Usage: Depending on the internal pinout, this is typically used either as an extension cable (straight-through) to connect a PC to a peripheral, or as a null modem (crossover) to link two computers or devices directly