someone just suggested that rengar's E is "hard CC"

oh nice

"Hard CC is anything that prevents the target from moving or attacking. Rooting, binding, stunning are all different types of Hard CC. Soft CC is anything that hinders the ability to move or attack, but does not prevent the target from doing so. Slows, silences and cripples are all different types of Soft CC"-http://forums.euw.leagueoflegends.com/board/showthread.php?t=2069282

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well for one you can still attack while snared and use defensive abilities... or peel for yourself.

: Mmm hmm... hows that workin out for ya?

i guess that makes sense.

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silence counts technically, last I checked. So does suppression

not root or snare

''Silence counts technically''

Well Silence an adc wont make a single different as opposed to silence on an AP caster.

So the definition of ''hard cc'' is different, i woudnt say root or silence is a hard cc. Thats stuns n knockups

To facilitate easier communications, crowd controls are usually described under one of the following systems:

Loss of Control - Crowd controls are grouped into one of two categories depending on whether or not the effect removes total control of the player's character. Hard CC completely removes all control of a character, while soft CC only partially removes it.

Hard CC Airborne Forced Action Stasis Stun Suppression Suspension

Soft CC Blind Disarm Root/Snare Silence Slow

Disruption - Crowd controls are grouped into one of two categories depending on whether or not the effect disrupts a channeled ability (such as Karthus Karthus's Requiem.png Requiem and Katarina Katarina's Death Lotus.png Death Lotus). Hard CC will disrupt channels, while soft CC will not.

Hard CC Airborne Forced Action Silence Stun Suppression Suspension

Soft CC Blind Disarm Root/Snare Slow

Movement - Crowd controls are grouped into one of two categories depending on whether or not they restrict movement. Hard CCs prevent all forms of movement, while soft CCs do not.

Hard CC Airborne Forced Action Root/Snare Stasis Stun Suppression Suspension

Soft CC Blind Disarm Silence Slow

Modifiers - Crowd controls are categorized by what their effects inhibit. Movement modifiers in some way inhibit the ability to move, while action modifiers in some way inhibit the ability to attack or cast abilities.

Movement Modifiers Airborne Entangle Forced Action Root/Snare Slow Stun Suppression Suspension

Action Modifiers Airborne Blind Disarm Forced Action Silence Stun Suppression Suspension

Source: http://leagueoflegends.wikia.com/wiki/Crowd_control

TL:DR its both, depending on which u are talking about.