The navigation bar is the panel at the bottom
of a number
of Android handsets (not all: some use physical /
capacitive buttons instead) that houses the Home,
Return and Recent Apps
buttons.
If you are familiar with Oxygen OS, you will know that you have the option to choose between on - screen navigation keys or
capacitive keys, and that feature
returns with the OnePlus X. However, it is worth mentioning that, given the relatively thin bottom chin
of the device, the
capacitive keys do fall quite close to the bottom edge
of the front, and it does seem like you have to reach really far down to get to these
buttons.