People who work in STEM (science, technology, engineering and math) fields and want to work temporarily in the U.S. often try to get an H-1B "specialty occupation" visa. These visas are only available to a limited number of people each year, however, and they are issued on a lottery basis.
There have been much discussion in the media recently about FLOTUS Melania Trump and how she obtained her lawful permament residence status in the U.S. Here, we provide better perspective on what the "Melania Trump Immigrant Visa" entails. Essentially, it is a type of employment visa or business immigration visa.