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It's called "right thrust"..... when the propeller is spinning, it tends to torque to the left. Setting the enine a degree or two to the right will counteract this left torque and the plane should run/fly in a straight line (providing there is no other forces coming into play eg:-bumpy field, cross-winds etc).
Boat props do the same thing also and should be offset the same way to counteract torque.
Having said this though.....torque could be overcome by adjusting your trim in flight or motion.
If on take off and torque is pulling to the left.....input some right rudder control to keep you tracked in a straight line. Hope this helps. I'm sure someone will have more input to help you with your question.