Italy runs on 230 V at 50 Hz, with sockets following Types C, F and L. At 230 V the supply matches what UK and European appliances expect, so no converter is needed.
You will find identical sockets in San Marino and the Vatican City. Watch out when moving on: Gibraltar, the Isle of Man and the United Kingdom use a completely different system. In Europe, 3 of 50 recorded destinations use exactly this combination.
Protective earth
Grounded and ungrounded sockets may occur
Not every socket in Italy is earthed: Types F and L yes, Type C no. Class I appliances belong in an earthed outlet.