Skill: Perception
Your Perception measures your ability to notice things, search for what’s hidden, and tell whether something about a situation is suspicious.
Mechanically, Perception is usually the most rolled skill in the game, due to its use. As such, it is a skill that almost anyone can use, even if one person in an adventuring party benefits from such, and can be supplemented in a variety of ways (from features to items). Notably, it is used for the Seek Action | ◈. Talents for Perception help cover those bases and/or assist in how a character wishes to specialize in Perception.
Perception uses INT / Intelligence or WIS / Wisdom by default. Perception is a Primary Skill, meaning it is a major skill that can only be gained by mechanics that grant proficiency.