This is the 2110th most frequent Catalan word.
tu
"You" (second person singular pronoun).
'Tu' is used here as a subject pronoun to address the interlocutor directly.
Tu ets molt amable.
You are very kind.
Here 'tu' is used with preposition 'a' to emphasize the recipient of the action.
He vist el regal que t'han fet a tu.
I saw the gift they made for you.
In this sentence, 'tu' is employed for emphasis, underlining the punctuality of the subject being addressed.