A passport is an official travel document issued by a government of the concerned country that certifies one's identity and citizenship. A passport is retained to facilitate the movement of individuals or small groups of people across international boundaries. The passport serves two purposes: to regain entry into the country of where an individual posse's citizenship and the second purpose is a requirement by many countries to gain entry to the country the individual is visiting. The most common official travel document issued by a government is a passport, which usually identifies the holder as a citizen of the issuing country. A travel visa is an official government document that temporarily authorizes any individual to be in the country you are visiting for the specified period of time. Visa, the official document is subjected to the permission of an immigration official at the time of actual entry into any country of the world. When the visa is issued, the passport will be stamped indicating the visa was issued and mentioning the expiry date of the visa. The country issuing the visa typically attaches various rules and regulations to the visa, such as the validity of the visa, the period that the individual may stay in the country, whether the visa is valid for more than one visit, etc.