Shoulder Hip Seperation

I see a lot of people on here talk about shoulder-hip seperation and I’m not really sure what that means. I see people say that Lincecum has a lot of this when he pitches. What does this do when pitching?
Could someone please clear this up for me. Thank you.

It gets more kinetic energy behind the throw

Ok thanks

hip/shoulder seperation is the amount of rotation your hips rotate before your shoulders begin to rotate

Ok i get it now thanks for clearin that up for me offset.

When well timed, it creates a rapid stretch across the torso, from the leading hip to the throwing shoulder, resulting in a more effective contraction that fuels shoulder rotation.