It's the specific form of stay contract used when entering Italy as a non-EU worker. Together with your employment contract, it ties your residence permit to the employer and the conditions of your hire.
It's the formal bridge between your work nulla osta, your employment contract, and your first residence permit. Skipping it means no permit at all.
"Following her Blue Card nulla osta, Sayuri travelled to the SUI in Bari with her new employer to sign the contratto di soggiorno per lavoro. The Questura summoned her for fingerprinting a few weeks later."
The contract obliges the employer to a housing role and return-trip costs in some cases. These obligations are written down even if everyone usually ignores them in practice for highly skilled hires.
Official source
Ministero dell'Interno
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