Look/Turn rate?

Hey everyone. I’m just starting to get into game development and I’m using a tutorial series to get myself familiar with how to use the engine. I’m watching the “3rd Person game” tutorial series from the official Unreal Engine YouTube channel and I’ve come to a point that I can’t understand very well. I could just follow the tutorial and it would probably work but of course, I’d like to understand why I’m doing these things so as to help me understand the engine and do things on my own.

Here is a link to the video with a timestamp to the part which confused me

I’m not sure what the difference is between look and look turn rate. They seem to me to perform the same function.
He does give a brief explanation but I still didn’t really understand. If anyone could help explain this to me I’d be very appreciative.