Not required for EU citizens. Nationals of Australia, Brazil, Canada, Japan, New Zealand and the USA do not need visas for visits of up to 90 days.
Citizens of EU countries, Iceland, Norway and Switzerland do not need a visa to visit Italy. Nationals of some other countries, including Australia, Brazil, Canada, Israel, Japan, New Zealand and the USA, do not require visas for tourist visits of up to 90 days. For more information and a list of countries whose citizens require a visa, check the website of the Italian foreign ministry (www.esteri.it).
The standard tourist visa issued by Italian consulates is the Schengen visa, valid for up to 90 days. This visa is valid for travel in Italy and in several other European countries with which Italy has a reciprocal visa agreement (see https://www.schengenvisainfo.com/eu-countries/ for the full list). These visas are not renewable inside Italy.