• H-1B Visa: The H-1B visa is one of the most common visas for skilled workers. It allows U.S. employers to sponsor foreign workers in specialty occupations that require theoretical or technical expertise. These occupations typically require at least a bachelor's degree or equivalent experience. The H-1B visa is initially granted for up to three years and can be extended for up to six years. There is an annual cap on the number of new H-1B visas issued, and the application process is highly competitive.

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• L-1 Visa: The L-1 visa allows multinational companies to transfer employees from their foreign offices to the United States. There are two types of L-1 visas: L-1A for managers and executives, and L-1B for employees with specialized knowledge. To qualify, the employee must have worked for the foreign company for at least one year in the past three years and be coming to the U.S. to work in a managerial, executive, or specialized knowledge capacity.

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• O Visa: The O visa is for individuals with extraordinary ability or achievement in their field, including the arts, sciences, education, business, or athletics. There are three types of O visas: O-1A for individuals with extraordinary ability in the sciences, education, business, or athletics; O-1B for individuals with extraordinary ability in the arts or extraordinary achievement in the motion picture or television industry; and O-2 for individuals who will accompany an O-1 visa holder as a support staff.

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• EB-2 and EB-3 Visas: The EB-2 visa is for professionals with advanced degrees or exceptional ability in their field, while the EB-3 visa is for skilled workers, professionals, and other workers. Both categories require a permanent job offer from a U.S. employer and a labor certification from the U.S. Department of Labor, unless the employer can demonstrate that there are no qualified U.S. workers available for the position.