Cisco console cable, also known as a rollover or Yost cable, used for configuring network devices like routers and switches.
It connects a computer's serial port to a network device's console port.
The cable has a DB9 connector on one end and an RJ45 connector on the other.
It is used for administrative terminal access to configure and manage Cisco devices.
Some models, like the one shown, have a USB connector instead of the DB9.