Form I-130A, also known as the Supplemental Information for Spouse Beneficiary, is a critical component of marriage-based green card applications. It must be filed alongside Form I-130, Petition for Alien Relative, when a U.S. citizen or lawful permanent resident sponsors their spouse for a green card. The purpose of Form I-130A is to provide additional details about the spouse (the beneficiary), such as their residence and employment history, which helps USCIS process the application thoroughly.