Weapons with “reach” allow their user to make Fighting attacks at the listed range. A reach of 1“, for example, allows a character to strike a target 1” distant. Weapons without a reach value can only strike targets at arm's length (adjacent).

Reach can be very important when fighting from horseback and against mounted foes (see __//[setting weapons on]//__ page 83).

Savage Worlds Deluxe Edition p. 55