Foreign nationals who wish to remain in Italy for a period that is less than 3 months for visiting purposes, business, tourism and study, are not required to apply for a residence permit. It is sufficient to simply declare one's presence on national territory.
For persons who come from non-Schengen countries, the declaration of presence takes place with the border police by means of a recognised Schengen stamp on the travel document.
For persons who come, on the other hand, from countries under the Schengen Agreement, the declaration of presence can be carried out directly in the Questura (Police Headquarters) within 8 days of arrival, by completing the necessary form (see below).
It is important that the duration of the stay on Italian territory does not exceed 3 months or the minimum term of the entrance visa, where required, and that entrance conditions are respected in full.