Learn Italian: Di che nazionalità sei? - What nationality are you?

In Italian, you literally ask "Of what nationality are you?". English just says "What nationality are you?", but Italian requires the preposition di (of) to talk about origin or category here.

Why isn't the word for "you" (tu) in this sentence?

The verb form sei already means "you are" (informal singular). Because the verb's spelling tells us exactly who the subject is, Italian usually drops the pronoun tu unless you want to add extra emphasis.

Does "che" always mean "what"?

Che is a very common word for "what" or "which" when placed directly before a noun, like in che nazionalità (what nationality). You will also see it mean "that" or "who" in other contexts, but in questions like this, it asks "what".

Why does "nazionalità" have an accent mark on the last letter?

The accent mark on nazionalità tells you to emphasize the final vowel when you speak. Instead of stressing the second-to-last syllable (the normal pattern in Italian), you stress the very last sound. As a helpful bonus tip: almost all Italian words ending in -tà are feminine!}