Citizenship refers to the ability to live, work and study in a nation. It may also include other duties such as the right to vote. Citizenship is usually a lifelong status and is only revoked in the rarest of circumstances. Residency is less permanent than citizenship and offers fewer rights. Residency programmes usually require individuals to be in the country for a set amount of time to retain residency. Unlike citizenship, residency can expire and must then be renewed. A passport is a travel document that can prove one’s citizenship status. Birth certificates or naturalisation certificates can also be used to prove this. There are different types of passports and for some versions, such as diplomatic or service passports, the holder does not have to be a citizen of said country.