In order to fully appreciate life and study in Italy, you should be able to speak the Italian language. This will help you to get by in day to day situations and may also be important for your studies. Many programmes at Italian universities are taught in English, particularly business related courses, but most of the available courses are taught in Italian.
You may need to pass a proof of language proficiency test before you can start your studies or are able to enrol. If your Italian is not great, there are many language courses offered to international students so you can improve your language skills whilst you study, or before you arrive in Italy.