What does this French word Tu mean?

"Tu" in French means "you". It's the informal, singular, second-person pronoun, used when addressing one person you know well, like a friend, family member, or someone you're close to.

Here's a breakdown:

* Tu: You (informal, singular)

* Vous: You (formal, singular or plural)

Think of it like the difference between "you" and "thou" in English, where "thou" is more familiar and "you" is more formal.