Italian is the official language of Italy, San Marino, Switzerland (along with Romansh, German and French) and Vatican City (along with Latin). It is also one of the official languages of Istria (along with Croatian and Slovene).
Italian is a relatively close language to Spanish, French and Portuguese, with significant mutual intelligibility. The written form of Italian is also quite close to that of Romanian, despite there being much less mutual intelligibility between spoken Romanian and Italian.