There are a few ways to say good-bye in German, just like in English.
Formal:
Auf Wiedersehen (Bye)
Auf Wiederhören (telephone only)
Gute Nacht (Good Night)
Informal:
Tschüss
Tschau
Tschö
Ade
Adieu
Servus
The people of Switzerland speak many languages including; German, German-Swiss and Italian. One of the most popular ways to say "goodbye" in German is "Auf wiedersehen".
To say "Goodbye" in Bavarian German you would say AufWiederschaun, in contrast to standard German which is simply Auf Wiedersehen.
Sag nicht Aufwiedersehen
to say goodbye, e.g.Wir haben uns am Bahnhof verabschiedet - we said goodbye at the train station
People in Canada speak English, so I imagine they would say 'bye'
selika
masalama
uhi
adios
In Puerto Rico, people commonly say "¡Hola!" for hello and "Adiós" for goodbye. Additionally, a more informal way to say goodbye is "Chao."
People say goodbye as life is very uncertain, the two may not see each other next day as one could be dead.
In French it's Au revoir "¡Adiós!", en español