Article: " This is the most formal and traditional way to say "goodbye" in German.  Pronounce "Auf Wiedersehen" as: owf vee-der-say-en  Even though this is the phrase most German classes probably teach first, it's somewhat old-fashioned, so you won't hear it spoken much by native Germans in casual settings. It's similar to saying "farewell" in English. Reserve this phrase to professional settings and other formal circumstances, especially when you're speaking with someone unfamiliar and wish to demonstrate a high level of respect or admiration. To make the phrase slightly less formal, you could also shorten it to “Wiedersehen.” " When speaking informally, this phrase is probably the most common way of saying goodbye in German.  Pronounce "Tschüss" as: chuuss  The English equivalent of "Tschüss" would probably be "bye" or "bye-bye" rather than "goodbye." Even though it's considered to be an informal way of bidding farewell, you should be able to use it with friends and strangers alike in most circumstances.
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Formally say "Auf Wiedersehen. Casually remark "Tschüs.