Adds "artificial human error" by slowing down the speed at which the crosshair moves to a target or adding a slight delay before firing.

Modern cheats often go beyond simple "locking on" and include features designed to mimic human playstyles.

These adjust the bullet's trajectory without snapping the player's crosshair to the target, making it much harder for observers or automated systems to detect.

Allows users to choose where to aim, such as the head for maximum damage or the chest to appear more like a legitimate player.

How to adjust your aim assist settings in Fortnite - Epic Games