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A visa is a permit issued by the foreign affairs or state department of a country. It allows you to enter the country. Visas are usually stickers placed inside your passport. In most cases, you must apply for it in your own country before you travel. Because of an agreement between many developed countries, some citizens do not require visas when they go to each other’s countries for short stays of less than three months, for business purposes, or as tourists. However, the purpose for which you enter a country must agree with the visa you receive. You cannot apply for most types of visas, or change visa types, once you are in the country. To enter as a student for a stay of longer than 90 days, you must apply for a visa before you travel. In other words, you cannot enter the country as a tourist and then register as a student. Similarly, you cannot get a short-term work visa and then enroll as a student
In some countries, student visas might be valid only for a short period of time, perhaps for a period of three months. This gives you enough time to enter the country during the period before the academic year usually begins. Upon arriving, you are expected to register at a university and obtain a residency card confirming where you will live while you are a student there. After you obtain the card, it becomes the proof of your right to remain in the country. If you go to a country as an intern for the summer and then begin a study program in the fall, you will probably require another visa and might have to return home between the two experiences.