Du and Sie: Germany's formality switch
Like French, German splits 'you' into du (informal, for friends and peers) and Sie (formal, for strangers, elders, and professional contexts). It shows up in greetings like Wie geht's? versus Wie geht es Ihnen?, so it's safest to start with Sie with anyone you've just met and only switch to du once they suggest it.
Where German greetings are used beyond Germany
German is an official language not just in Germany but also in Austria, most of Switzerland, and Liechtenstein, and it has the largest number of native speakers of any language in the European Union. Regional accents and some vocabulary vary, but the greetings above are understood across the German-speaking world.
Frequently Asked Questions
Is Hallo enough on its own?
Hallo works comfortably in most everyday situations regardless of time of day or who you're talking to. For more formal settings, it's worth also learning Guten Tag, which sounds a bit more polished.
Do Austrians and Swiss German speakers use the same greetings?
The core phrases here are understood throughout the German-speaking world, though Austria and Switzerland each have their own regional expressions and a noticeably different accent from standard German.