The H-1B visa is a non-immigrant visa that allows U.S. companies to employ foreign workers in specialty occupations. These jobs typically require a higher education degree or its equivalent, such as in fields like technology, engineering, or medicine. The visa is valid for three years and can be extended for up to six years. To obtain an H-1B visa, employers must file a petition with the U.S. Citizenship and Immigration Services (USCIS) and demonstrate that the position requires specialized knowledge. There is an annual cap on the number of H-1B visas issued, making the application process competitive.