Visa

B-1/B-2 Visa
A B-1 visa is issued to a foreign citizen seeking to enter the United States of America for business purposes, while a B-2 visa is granted to a foreigner seeking to enter for tourism purposes. In practice, the two visa categories are usually combined together and issued as a "B1/B2" visa valid for a temporary visitor for either business or pleasure or a combination of the two.

Green Card Application Process

Immigration through Employment 

If you want to become an immigrant based on the fact that you have a permanent employment opportunity in the United States, or if you are an employer that wants to sponsor someone for lawful permanent residency based on permanent employment in the United States, you must go through a multi-step process. 
First, foreign nationals and employers must determine if the foreign national is eligible for lawful permanent residency under one of USCIS' paths to lawful permanent residency.  
Second, most employment categories require that the U.S. employer complete a labor certification request (Form ETA 750) for the applicant, and submit it to the Department of Labor's Employment and Training Administration.  
Third, USCIS must approve an immigrant visa petition, Form I-140, Petition for Alien Worker, for the person wishing to immigrate to the United States. The employer wishing to bring the applicant to the United States to work permanently files this petition.  
Fourth, the State Department must give the applicant an immigrant visa number, even if the applicant is already in the United States. When the applicant receives an immigrant visa number, it means that an immigrant visa has been assigned to the applicant. You can check the status of a visa number in the Department of State's Visa Bulletin.  
Fifth, if the applicant is already in the United States, he or she must apply to adjust to permanent resident status after a visa number becomes available.  If the applicant is outside the United States when an immigrant visa number becomes available, he or she will be notified and must complete the process at his or her local U.S. consulate office.