Throw is the Offensive stat that affects how much damage with the Throw type will do; the higher, the better. A high Throw score will assist you in Parrying attempts against attacks with the Throw type, assuming you have the Parry ability.
Throw represents your proficency with throws and slams. It may also measure your skill and proficency with joint-locks, holds, and similar manuvers that are less reliant upon brute force than knowing how to turn a body-part in a way that causes pain for the opponent.
People who specialize with Throw techniques are usually slight-of-build, thus frequently making them weaker at Physical and Soak, but also often improving their Roll and Reflex scores.