It is used to indicate that the person being addressed shares a quality, action, or feeling with someone else.
Here are some examples of how "vous aussi" can be used:
* "Tu aimes le chocolat? - Oui, moi aussi." (You like chocolate? - Yes, me too.)
* "Je vais au cinéma ce soir. - Vous aussi?" (I'm going to the cinema tonight. - You too?)
* "Il est très gentil. - Vous aussi." (He is very kind. - You too.)
Note: "Vous aussi" is the formal way of saying "you too". The informal equivalent is "toi aussi".