What's the difference between follow focus and chasing coke?

The differences between follow focus and Jiao Jiao are as follows:

FOLLOW FOCUS refers to changing the focal length as people or objects approach or leave the camera when shooting a lens, so as to keep accurate focus.

Focusing is to use the characteristics of relative motion to keep the camera and the object moving synchronously and horizontally, with similar speed, and with appropriate shutter speed, you can shoot works with blurred background and flowing feeling. On the surface, "back-focus shooting" is shooting moving objects, but in fact it is two concepts from what we usually say: shooting moving objects with a fixed camera.