It's the online portal for filing applications to the Sportello Unico per l'Immigrazione, like work nulla osta and family reunification. Employers, families, and lawyers use it to submit and track requests.
Most SUI procedures now start online through this portal. Without an account and supporting digital documents ready, you can't even file during a click day.
The portal has evolved over the years (ALI, then variations). Always go through the official Ministero dell'Interno entry point to make sure you're on the current portal.
Official source
Ministero dell'Interno
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