A passport is a document that is considered official which is given by the government to certify that the individual's identity as well as citizenship. The passport enables them to be able to travel under the protection of the passport to and from different foreign countries. One cannot, therefore, leave to a different country without a valid passport. A passport helps in identifying an individual's nationality before they travel to other countries. A passport carries someone's personal details which include your name, date of birth and place of birth, your signature and your recent photograph. It may also include any other information that may be used to identify you. There are many countries who are considering changing passport such that one's information can be put in a microchip which will be embedded inside the passport so that it is readable by a machine. This would help in ensuring that it is not counterfeited in any way. See more here!
Once you are issued with a passport, it remains valid until you it expires so you do not change it before expiry. One has to renew it once it expires for you to be able to travel to different countries. You cannot travel with an expired passport. One can use a passport in other instances such as when you are changing local currency or when checking into various hotels. It helps you to be able to identify yourself since it contains all your details. A passport, therefore, serves many purposes. Apart from identity, a passport helps you in the booking of tickets for you to travel abroad. A passport is also required when one is landing in another country. They will be asked for a passport before they are allowed to go into the country. A passport is also required when you are going to a country for tourism purposes or when going there to study or even when you are going to settle in a certain country. Visit this helpful link; USPassportHelpGuide.com
In cases when one is involved in a certain crime, the passport is used in tracing them since it has all their details. A passport is also used when tracing someone who may be missing abroad. The details written on the passport are used in looking for them. A passport is also used when identifying an individual who died abroad. Their details will also be used to trace their family. This helps in making the process easy as the details enable the authorities to trace where the individual comes from. A passport is also used when one needs to get a sim card and when opening a bank account in, therefore, country. A passport is, therefore, a very important document.
Read further here;
https://en.wikipedia.org/wiki/Passport