What is American EB professional immigration, introduction and classification?

The following are compiled by immigrants from Cai Ying:

Professional immigrants are divided into five priority categories:

EB 1 (the first priority category) includes heterogeneous professionalism, outstanding professors and researchers, and multinational executives of multinational companies.

EB2 (the second priority category) is a highly educated or high-tech professional who has applied for a work permit;

EB3 (the third priority category) includes ordinary professionals, skilled workers and unskilled workers who apply for immigration through work permits; EB4 (the fourth priority category) is a religious person;

EB5 (the fifth priority category) is investment immigrants.