What is 'You make me happy' when translated from English to Italian?

"You make me happy" in English means Mi fai felice in Italian.

Mi fai felice is an Italian equivalent of the English phrase "You make me happy."

Specifically, the object pronoun mi is "me." The present indicative verb fai means "(informal singular you) are making, do make, make." The feminine/masculine adjective felice translates as "happy."

The pronunciation will be "me feye* fey-LEE-tchey" in Italian.

*The sound is similar to that in the English noun "eye."