The Special Immigrant Green Card confers permanent residence upon a few foreign nationals whom it deems so eligible. Unlike the more general family- or employment-based Green Cards, this category includes special groups: religious workers, special immigrant juveniles, Afghan and Iraqi translators/interpreters, international broadcasters, and certain employees of international organizations. All these categories have completely different eligibility requirements and application procedures in place but are either highly valued or in a very vulnerable situation. The process involves filing a petition, waiting for visa availability, having Medical and consulate interviews, and finally getting the Green Card in case of approval. It is always advisable to consult an immigration attorney or a professional like Oasis Resource Management for personalized assistance.
https://www.oasis-india.com/who-is-eligible-for-a-special-immigrant-green-card-in-the-us/