The DS-260 is the Immigrant Visa and Alien Registration Application, which is required for foreign nationals applying for a family-based green card from abroad. The DS-260 is an online form that must be completed by the applicant and each qualified family member immigrating with them. The form is used to collect biographical information about the applicant, including their name, address, employment history, and education. The DS-260 is mandatory, and most fields on the form are required. However, fields marked "Optional" can be left blank, and fields that do not apply to the applicant can be marked "Does Not Apply". The form can be saved and completed in multiple sessions, and a confirmation page must be printed and brought to the visa interview. It is important to note that the information entered on the DS-260 must match the information in the applicants passport.