Such passports have an area where some of the information otherwise written in textual form is written as strings of alphanumeric characters, printed in a manner suitable for optical character recognition.
This enables border controllers and other law enforcement agents to process these passports more quickly, without having to input the information manually into a computer.
Reasons and supporting documentation (such as a letter from an employer) must be provided to apply for a second UK document.
Where a country does not recognise another, or is in dispute with it, it may prohibit the use of their passport for travel to that other country, or may prohibit entry to holders of that other country's passports, and sometimes to others who have, for example, visited the other country.
Some countries and international organisations issue travel documents which are not standard passports, but enable the holder to travel internationally to countries that recognise the documents.
King Henry V of England is credited with having invented what some consider the first true passport, as a means of helping his subjects prove who they were in foreign lands.
The earliest reference to these documents is found in a 1414 Act of Parliament.
A passport holder is normally entitled to enter the country that issued the passport, though some people entitled to a passport may not be full citizens with right of abode.
A passport is a document certifying identity and nationality; having the document does not of itself grant any rights, such as protection by the consulate of the issuing country, although it may indicate that the holder has such rights.Passport standardization came about in 1980, under the auspices of the International Civil Aviation Organization (ICAO).ICAO standards include those for machine-readable passports.British tourists of the 1920s complained, especially about attached photographs and physical descriptions, which they considered led to a "nasty dehumanization".While the United Nations held a travel conference in 1963, no passport guidelines resulted from it.For example, stateless persons are not normally issued a national passport, but may be able to obtain a refugee travel document or the earlier "Nansen passport" which enables them to travel to countries which recognise them, and sometimes to return to the issuing country.