Perception defines how sensitive and capable one is at detecting things by means of their senses, such as sight, smell, taste, hearing, or touch.
With a strong Perception, many upcoming or current events could be quickly and accurately deduced based on any sensory details. You could tell if there's something ahead in the dark, if a dead body is inside this building, or if your food has been poisoned. Alongside Intuition, this is also a fairly important Skill for the cautious. The difference between Perception and Intuition, is Perception is more accurate, but requires real sensory evidence as opposed to a hunch or feeling.