J-Link OB is an on-board debug probe as part of YOUR eval board. The microcontroller has a USB-interface on one side and a JTAG/SWD + SWO etc. interface on the device side. It allows debugging the target device on the board it comes with, without the need for an additional debug probe. J-Link OB is used on various eval boards by several eval board manufacturers for various target CPUs.

For More Details on PC Click here

For More Details on Portables Click here.