Charisma is one of the six core attributes that define your character’s fundamental aptitudes. It represents charm, persuasiveness, and force of personality, and is used everywhere the game cares about impression, performance, and raw social impact.
Mechanically, Charisma typically:
Modifies key social skills like Diplomacy, Deception, Intimidation, and Performance.
Governs some spellcasting traditions (psychics, mystics, envoys, and other will‑driven casters often key off Charisma).