A machine-readable passport is a passport that has information that can be read by a machine. Usually, this information is stored in one or two lines, which encode some of the information in machine readable form. The information is then extracted using optical character recognition. Usually, this is the given names, family name, date of birth, sex, and validity of the travel document. Machine-readable passports (or machine-readable travel documents) have been used since the 1980s. Today, most passports, and travel documents are machine readable. 