It is the so-called black job, which occurs when you are not registered in the registry book that the employer must keep and you are not registered in the ANSES
When you are registered you have:
You can:
No. Signing a contract does not indicate that you are already registered. But it serves as proof if the employer wants to ignore the employment relationship.
Source: https://www.argentina.gob.ar/justicia/ derechofacil/leysimple/trabajo-registrado#titulo-1