Reach

Creatures have a Reach determined by their Size which dictates the distance at which they can attack, grab, or otherwise physically affect other creatures. Medium creatures have a 5ft reach, while small creatures have a 3ft reach, usually requiring them to be adjacent to targets to affect them physically. For the natural reach of creatures of smaller or larger sizes, see the Size Categories page).

Certain weapons, denoted by the Reach Weapon property, extend a creature's natural reach. Creatures utilizing reach weapons can therefore target creatures farther away then their natural reach allows.