Is there a big difference between using highlighter and contouring?

I have never tried highlighter, and

I don't really know much about shading either, aside from just swiping it lightly on my jaw and nose a few times.

But when I see people wearing makeup, I notice they really use it a lot.

Of course, there would naturally be a big difference for celebrities or people who work professionally for things like photography, but

Is there a significant difference between using those two and not using them, even in everyday makeup?