Formal:
* Adeus: This is the most formal way to say goodbye. It is often used in written communication or in situations where you are addressing someone you don't know well.
* Até breve: This means "until soon" and is a more formal way to say goodbye than "tchau" or "xau."
Informal:
* Tchau: This is the most common way to say goodbye in informal situations. It's equivalent to "bye" or "see ya" in English.
* Xau: This is another informal way to say goodbye, similar to "tchau."
* Até logo: This means "until later" and is a more informal way to say goodbye than "até breve."
* Até mais: This means "see you later" and is similar to "até logo."
* Valeu: This means "thanks" or "cheers" and can be used as a casual goodbye, particularly among friends.
Regional variations:
* Fui: This is a common informal way to say goodbye in Brazil.
* Falou: This is another informal way to say goodbye in Brazil.
The best way to choose the right phrase depends on the situation and your relationship with the person you are saying goodbye to.