Employment-based green cards are granted in the following categories:

EB 1 - First Preference

(a) Persons of Extraordinary Ability
(b) Outstanding Professors and Researchers
(c) Multinational Executives and Managers

No Labor Certification is required for these categories. For persons of extraordinary ability in the sciences; arts, education, business, and athletics, a job offer is also not required.

EB2 - Second Preference

(a) Persons of "exceptional ability" in the sciences, arts, or business.
(b) Advance degree professionals.

Job offer and  Labor Certification are required in this category. Job offer can be waived in the national interest, in which case Labor Certification is also not required.

EB3 - Third Preference

(a) Professionals with bachelor's degrees
(b) Skilled workers
(c) Unskilled workers

The beneficiary should have a job offer and the employer should have completed the  Labor Certification process.

EB4 - Fourth Preference

Special Immigrants and Religious Workers

EB5 - Fifth Preference

Investors in commercial enterprises.