The H1B Visa is the most common type of visa used by American employers to obtain employment authorization for foreign workers. The H1B is very popular because it enables American employers to hire educated and or experienced foreign workers to come work in the United States. In the computer and high tech sectors the H1B sectors is an essential business tool. The H1B is particularly desirable because the American employer can obtain the H1B without establishing that there is shortage of qualified American workers.
Although the H1B is a non-immigrant visa, it permits its holder to possess “dual intent”, that H1B holders are permitted to possess dual intent is very advantageous. The right to dual intent enables H1B holders to apply for immigrant visas without validating their H1B non-immigrant visa. Indeed many H1B holders ultimately are able to obtain permanent Resident status or Green Card through their employment in the United States. Ordinarily non-immigrant visa applicants and visa holders are expected to have non-immigrant intent and must establish that they will return to their home country upon expiration of their non-immigrant visa such as in the case of a student (F1) visa.
To read more download American Work permit – Official Rules & Regulations of American Work Visa