Do I need to configure joystick right/right, right/left, etc?

I’m getting used to running all sorts of cool shit with MaME, and I’m trying to figure out what the joystick settings “right/right,” “right/left,” “left/left,” and “left/right” are, if I need to set them at all, and if so, which way do I point the stick to set these. Please help!

Just set, left, up, down and right.