An immigration visa is a travel document that allows you access to a country for which you are not a citizen or resident. Once you reach a port of entry, you must present your immigration visa so that the officials see what the intent and purpose of your trip into the country is. There are a variety of different visas for the purpose of students and education abroad, employment on a seasonal or long term basis, family relationship, and even just a travel visa. To become a legal immigrant of a given country, it is essential to follow the process and get the appropriate visa in place. An immigration visa will allow you to lawfully stay in the given country for the stated duration and for the purposes indicated at time of application.