Congress divides employment-based green cards into preference categories, each with its own eligibility bar and its own place in line. The higher the preference, the faster the path tends to move. Choosing the right category is the single most important decision in an employment-based case, because it sets your priority date, your evidence burden, and whether you need an employer to sponsor you at all.
The first preference, EB-1, is for people at the very top of their field: those with extraordinary ability, outstanding professors and researchers, and multinational managers and executives. The second preference, EB-2, is for professionals holding an advanced degree or people with exceptional ability, and it contains the national interest waiver, a route that lets qualifying applicants skip the labor certification and the job offer entirely. The third preference, EB-3, is for skilled workers, professionals with a bachelor's degree, and other workers, almost always after a PERM labor certification.
Most people qualify for more than one category. The art is in matching your record to the category that gives you the strongest case and the shortest wait. That is the conversation we have first, before a single form is filed.