Perception and Detection

Your Perception modifier indicates how good you are at noticing things around you. You typically use the Seek basic action to find physical things or the Sense Motive basic action in social situations. While in exploration mode, the Search activity lets you keep an eye out for things around you.
Four main conditions indicate how well you can pinpoint and target a creature: observed, hidden, undetected, and unnoticed. A creature with the concealed or invisible condition is harder to find and target.
Related: Light, special senses