Visa is a permission granted by any country to enter that country. For securing the Visa of any country, you have to apply to the consulate office of that country in your own country. Visa granted by a foreign country may be of various types, with different conditions attached to each of them. A Transit Visa allows you to stay in that country just for a day or two, while a Tourist Visa may allow you to stay for periods up to several months. For a Business Visa, the periodicity of the Visa depends on your need to stay in that country. A student Visa is granted to students and is valid generally for the period of study ( including grace period) and permission of work outside university is not allowed. Almost all these Visas will stipulate that you cannot take up a job in that country during the period of your stay.