Boosting in Call of Duty 4 is a technique used to quickly level up a player’s character or unlock new weapons and equipment. It involves joining a game with a player who is already at a high level and then intentionally dying to give them experience points. This process can be repeated multiple times to quickly level up a character.
Boosting can be a controversial practice, as some players view it as a form of cheating. However, it can be a useful way to quickly level up a character without having to spend hours grinding through the game. It is also a way to unlock new weapons and equipment that would otherwise be difficult to obtain.