One of the most sought after visa is known as the H-1B visa which an employment based visa. An employment-based visa allows you to work in the United States and eventually allows you to become a permanent resident. This allows about 140 thousand people a year to get a green card.
There are 5 categories
Requirement for National Interest Waiver:
To be exempt from the PERM process you must show that going through the process will be contrary to national interest. An example would be someone working on a cure for cancer or special weapons for United States who can show that stopping the process and finding someone minimally qualified would be contrary to the nation’s interest. Physicians working in an underserved area can qualify for National interest waiver (NIV). For more on national interest waiver see “Do I qualify for National Interest Waiver?