A work visa is a legal document that allows foreign nationals to work in a specific country for a designated period. These visas are typically issued by the government of the host country and require the applicant to meet certain criteria, such as having a job offer from a local employer or possessing specialized skills. Different countries have various types of work visas, each with its own rules and application processes. Common categories include temporary work visas, which are for short-term employment, and permanent work visas, which allow individuals to live and work indefinitely.