The L-1 visa is a non-immigrant visa that allows companies to transfer employees from an overseas office to a U.S. office. It is primarily designed for managers, executives, and employees with specialized knowledge. This visa helps multinational companies maintain a global workforce and facilitate business operations in the United States. There are two main types of L-1 visas: the L-1A for managers and executives, and the L-1B for employees with specialized knowledge. The L-1A visa is valid for up to seven years, while the L-1B visa is valid for up to five years.