An H-1B visa is a non-immigrant U.S. visa that allows U.S. employers to temporarily hire foreign workers in specialty occupations. These occupations generally require specialized knowledge and at least a bachelor's degree or equivalent in a specific field. The visa is initially granted for three years but can be extended up to six years. It allows foreign professionals to work in the U.S. and can serve as a stepping stone to permanent residency (a green card) because it permits dual intent, meaning visa holders can apply for a green card while on H-1B status. The visa requires employer sponsorship, and there is an annual cap on the number of new H-1B visas issued, with a lottery system if applications exceed this cap.