Visa categories are classifications that determine the purpose and duration of a foreign national's stay in a country. Each category has specific requirements and conditions, such as work, study, or tourism. For example, a student visa allows individuals to attend educational institutions, while a tourist visa permits short visits for leisure. Different countries have their own visa categories, which can vary widely. Some common categories include work visas, family reunification visas, and business visas. Understanding these categories is essential for anyone planning to travel or relocate, as they dictate the legal framework for entry and stay.