The I-9 Form is a document used in the United States to verify the identity and employment authorization of individuals hired for work. Employers must complete this form for each employee, ensuring that they are legally allowed to work in the country. The form requires information such as the employee's name, address, and Social Security number, along with supporting documents that prove their identity and eligibility. Employees must present acceptable documents, which can include a U.S. passport, driver's license, or Social Security card. The completed I-9 Form must be retained by the employer for a specific period and made available for inspection by U.S. Citizenship and Immigration Services (USCIS) if requested.