Dolly vs Zoom

What is the difference between zooming and dollying? What do dollying and trucking add to the shot?
While zoom is created through a static camera change in focal length. A dolly is created by moving the actual camera closer or farther. (Usually on a set of tracks) a dolly can be created using a prime lens, that's because the lens doesn't need to do anything. While a zoom shot only adjusts the camera's focal length a dolly zoom moves the entire camera toward a subject.

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