A hitbox is a representation of the hit detection system used by the Counter-Strike series.
Different hit regions represent the different areas of the body, such as the head, which influence the damage of a shot.
In early Counter-Strike games, the boundaries for the individual hitboxes were outside their respective body parts, making the hitboxes larger than the actual model. Starting with the September 15, 2015 update of Counter-Strike: Global Offensive however, the boundaries for the individual hitboxes were placed almost entirely inside their respective body parts by incorporating capsules instead of boxes.
Hitboxes can be displayed using the console command
sv_showhitboxes when cheats are enabled. However, due to the complexities of the networking code, this may not accurately represent how hits are actually determined, particularly in Source and Global Offensive where the networking code is more complex. More recent versions of the Source engine have disabled the
If a single bullet passes through several hitbox areas with different damage multipliers, then it will inflict the highest amount of damage in the different damages. 
Hitbox damage multipliers
|Chest & Arm||100% (1X)|
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