There are five categories of employment based immigration:

• First Preference (EB-1 priority workers): foreign nationals with extraordinary ability, outstanding professors and researchers, and certain multinational executives and managers.
• Second Preference (EB-2 workers with advanced degrees or exceptional ability): foreign nationals who are members of the professions holding advanced degrees or their equivalent and foreign nationals who, because of their exceptional ability in the sciences, arts, or business, will substantially benefit the national economic, cultural, or educational interests or welfare of the United States.
• Third Preference (EB-3 professionals, skilled workers, and other workers): foreign nationals with at least two years of experience as skilled workers, professionals with a baccalaureate degree, and others with less than two years’ experience, such as an unskilled worker who can perform labor for which qualified workers are not available in the United States.
• Fourth Preference (EB-4 special workers such as those in a religious occupation or vocation): foreign nationals who, for at least two years before applying for admission to the United States, have been a member of a religious denomination that has a non-profit religious organization in the United States, and who will be working in a religious vocation or occupation at the request of the religious organization.
• Fifth Preference (EB-5 Employment Creation) Entrepreneurs engaging in a new commercial enterprise in the United States.