Stun

Stun is a status effect that prevents active actions like moving, turning, using spells, items, but does not prevent passive abilities, such as evasion, damage block. Stuns also interrupt any casting or channeling spells and attacks. Many spells cause stun which make them effective for stopping and killing your enemy. Stuns also allow for easier escapes as they prevent your enemy from pursuing you temporarily. It is usually considered to be the strongest disable, which is why most stuns do not last for more than few seconds.

Sources of Stun

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Mini-stun
Mini-stuns are similar to stuns. They disable enemies, but for extremely short periods of time. Whereas a regular stun may last a second or more, mini-stuns will last for fractions of a second. Like stuns, they will interrupt spellcasts, making them effective for stopping enemy abilities.