CD, short for cooldown, is the amount of time a player must wait before using an ability, item active, or summoner spell again. When one of these tools is unavailable, it is considered to be on cooldown. Managing CDs is an essential part of decision making because using a key ability at the wrong time can leave a player vulnerable to Gank pressure or trading disadvantages.
Cooldowns are reduced by stats such as ability haste, item haste, and summoner spell haste, enabling champions to cast their abilities more frequently throughout fights. Champions who rely heavily on burst damage or strong utility spells must track their own CDs as well as the CDs of enemies. In teamfights, knowing when important CC or defensive spells are down often determines whether a team chooses to engage, disengage, or continue applying pressure.
Because every CD creates a temporary window of weakness or strength, effective cooldown tracking greatly improves overall combat efficiency and map impact.
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