This area applies if you are seeking employment or an organization (entity) is seeking to hire an employee for one of the following specialties: physician, nurse, physical therapist, other health care provider, accountant, engineer, computer specialist, athlete, professor, scientist, musician, executive chef, model, entertainer, inventor, religious clergy, machinist, skilled craftsman, seasonal worker, or a person with unique talents or abilities, etc.

This area applies if you are spouse, parent, child, brother/sister, or a fiancée/fiancé who wishes to sponsor a relative from a foreign country.

a. you are having problems with the Department of State, or need your file, etc.
b. you want to obtain US citizenship if one of your parents is a US citizen.
c. you want to become a naturalized US citizen if you are a permanent resident.