A “hook”, otherwise known as a “hook shot”, in golf refers to a shot that results in the ball turning significantly right-to-left off course (for a right-handed golfer. For left-handed golfers, the hook displays a left-to-right curve in flight).
Sometimes, the hook can be played intentionally. However, more times than not, it is the result of a mishit.
In the golfing world, a hook is considered similar to a draw but more severe, plus it could be described as the opposite of a slice.
Occasionally, a severe hook can be referred to as a “snap hook” or a “duck hook”. When these terms are introduced, it typically means that the flight of the ball started straight before curving significantly towards the left – causing an extreme mishit.