There are many types of visas that allow you entrance into the U-S. B-1 visitor visas allow aliens to enter the U-S temporarily for business, while B-2 visitor visas are issued for those coming to the U-S for tourism or family visits. D-visas are for crewman; E for treaty traders and investors; F for students in academic or language programs; H for temporary workers; I for journalists; K for the fiancé of a U-S citizen; M for students in vocational or other non-academic programs; O for temporary workers with extraordinary ability; P for athletes and entertainers; and R for religious persons. To apply for a non-immigrant visa with the U.S. consulate, you'll need to complete form 0-F 1-56. You'll need to show that your passport is valid for at least six months after your intended stay. Each traveler will need a separate application, regardless of age. A photograph and proof supporting the purpose of your visit and the date you plan to depart are also required. You can only enter the U-S for the purpose stated in the type of visa you apply for. Those applying for H and L visas must present a prior approval by the INS (I-N-S). You are still subject to inspection by the INS at the port of entry to the U-S. At this time, immigration authorities will determine how long you can stay. If you stay longer than this time frame, you may be deported and charged a fine for your visa. For more information, you can contact an immigration attorney in your area.