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This is a very general answer to your question. A variable pitch propeller can be turned . If the blades were flat faceing forward they would not do their job. When the blades are turned at a slight angle (the pitch) then they bite into the air and this helps with forward movement. The more pitch the better the blades cut into the air, but if the pitch is to much, then the blades no longer cut into the air and forward motion stops. The blades can be set for reverse pitch which allows a plane to slow down very quickly once it has landed on a runway (this helps to save on the brakes) and can also be used to back a plane up, such as from a boarding gate, or to park a plane.

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