Endlag is the period of time where the player is unable to act after performing certain actions. Sometimes referred to as Recovery, it is often seen after movement options or Attacks. The implementation of Endlag varies from game to game, with some having little to none, and others having an abundance.
Endlag is not to be confused with Cooldown, a similar mechanic that also prevents the player from taking actions. When a player is in Endlag, they are unable to take any actions at all, usually for a short period of time. On the contrary, a Cooldown often applies to one specific action (or a set of actions) and is usually longer than Endlag.