Dollying And Zooming

 What is the difference between zooming and dollying?  What do dollying and trucking add to the shot?

Zooming in doesn't change the spatial relationship of the objects in the frame. When you zoom in, you're just using your camera lens (or editing) a zoom into your subject. This is used in movies such as horror movies and action movies, and you can use it to make the subject feel closed in on, and trapped. This is used to focus on one particular subject in the frame, and draws all the energy towards it. When watching a zoomed in scene, you aren't exactly experiencing the emotions of the character. You're on the outside, observing what's happening. When you dolly in, you're physically moving your camera towards the subject. This can give you shot more depth and add more detail to your scene. When you dolly in, you can be forcing your audience towards danger or having them leave a situation. This connects us with the characters more than a zoom. It feels more personal.