HOTAS as an acronym stands for "Hands On Throttle And Stick", basicly describing a joystick
that can be connected to a PC
or a console
in order to deliver a maximum in realism, immersion and flexibility to the user.
What sets a HOTAS apart from an "average joystick" is that is consists of two modules that are in some way physically connected:
The "stick" and the "throttle".
Each requires the use of one hand for operation, hence the name.
The only ways of further upgrading a HOTAS system are adding control pedals and/or a head-mounted motion-tracking system.