How do Germans say "OK"?

Germans say "OK" exactly like in English, and it is one of the most used loanwords in everyday German. You will hear it pronounced as "oh-kay" everywhere, in offices, among friends, and on TV. It is written as "okay," "OK," or "O.K." and is fully accepted as correct German. However, Germans also have many native equivalents that they use depending on the situation and region. The most common are "Alles klar" which literally means "everything clear" and is used like "alright" or "got it," "In Ordnung" often shortened to "I.O.," and "Alles gut." For agreeing to do something, they say "Klar" meaning "sure" or "Geht klar." When confirming they understood an order or instruction, they often say "Verstanden" or "Alles klar, mache ich." In casual texting, young Germans will just write "k" or "kk" for "okay okay." In southern Germany and Austria you might hear "Passt schon" meaning "that works" or "it's fine." So while you can always say "OK" and be perfectly understood, mixing in "Alles klar" and "In Ordnung" will make you sound much more natural and native-like.