Curve/Slider


#1

I really dont no much about a curveball or slider. But when i was reading the book Pitch Like a Pro, which is very good by the way, it said Leo has his pitchers throw a throw and turn breaking-ball. I always thought a curve was one grip and slider another, throwing it the same. Well has its described it seems its different then most curves/sliders.
Does anyone thorw this type of breakingball ? How does it work ?
Whats the difference between “throw and turn” and the other one ?
What one do you tihnk is better ?

Just a bit confused.