Crowd control

Crowd Control, or CC, is the term used to describe a spell or ability that temporarily reduces a unit's ability to fight. Crowd control abilities effectively lower the number of opponents that must be dealt with in skirmishes and shrewd use of crowd control can swing team fights favourably. Crowd control can disable threats or make escape difficult for opponents. The presence of crowd control abilities may make difficult situations survivable or even save team members.

Types of Crowd Control
There are three fundamentally different categories of crowd control, with most specific forms of CC falling under one or more of them.
 * Movement Modifiers restrict or reduce the target's movement or force a particular move.
 * Slows, Snares, Knockbacks
 * Action Modifiers restrict the target's ability to perform some actions or reduce those actions' effectiveness.
 * Blinds, Silences, Stuns, Knockups, Suppresses
 * Forced Action Modifiers force the target to take a certain action.
 * Taunts, Fears

Countering Crowd Control
Crowd Control can be countered in three different ways.

The first and most preferable one is preventing it. Outside of staying out of range, there are the passive on, spell shields like , , and. Some crowd control, like the passive from, relies on hitting with a basic attack, these can be stopped by dodge chance.

The second one is removing it alltogether. This can be done with the item and the summoner spell. Some champion abillities can remove all crowd control effects, like or.

The last, and most common one, is reducing it. This is done with any item that provides Tenacity, this effect is unique. Tenacity does stack with champion abilities like and. Note, however, that duration reduction has no effect on suppression, knockup, or knockback.

Movement Modifiers
The first classification of crowd control are the negative movement modifiers. These are slows, snares and knockbacks. You can follow the link above to see a list of all items and abilities that can produce this effect.

Action Modifiers
Action modifiers (more commonly known as disables) prevent or reduce the effectiveness of actions the afflicted unit can take. By blinding a melee DPS champion, you are preventing him/her from dealing damage. Other champions, particularly casters, rely on their abilities extensively in combat. Preventing these abilities from being activated will effectively render those champions useless.