The "Harvest" Moon and the "Hunter's" Moon are the nicknames traditionally given to the full moons during the Fall season. The "Harvest" moon is the full moon closest to the Autumnal Equinox. The "Hunter's" moon is the 1st full moon following the "Harvest" moon. In most years these are the full moons that occur in September and October respectively.
The "Harvest" moon occurred on September 19th.
So that means the Full moon, tonight (October 18th) is considered the "Hunter's" Full Moon.
The story is told that the term "Hunter's" moon came about because Native Americans would use the full moon in October to hunt all night in order to stock up on meat for the upcoming winter season.