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A trap is a hidden danger that can cause sudden unwanted conditions and/or damage.
Involvement
A vent that spews toxic gas or a 
that zaps creatures that trip it are both examples of traps.
The Perception skill is used to detect traps and a 
Trap Disarm Toolkit along with the Sleight of Hand skill is used to disarm traps. Vents can also be disabled by placing a heavy enough object on-top of them.
Some traps will be visible without a Perception check, but unless a character detects them they cannot be disarmed and can only be avoided.