This article is a travel topic
A passport is a government-issued identification which allows the passenger to travel freely outside the home country (subject to regulations of other countries) and, with limited exceptions, is an essential requirement for international travel.
For many country pairs, a passport alone is insufficient and must contain a visa issued by the destination country. Neither passport nor visas guarantee entry into a foreign country -this is always ultimately subject to the discretion of the immigration officer at the border.
Domestically, passport can be useful identification to obtain certain services such as a new bank account.
The first convention on passports was when, in 1920, the League of Nations decided that all passports contain information in French, being the diplomatic language of that era. Today all passports contain information in at least English and French, as well as the official language(s) of the issuing nation (if not English or French).
The cover page includes the word "passport" and the name of the the issuing country in the native language(s) of the issuing country(and possibly a second language, such as English); some sort of national symbol; and special, universal symbol if it is biometric. Additionally, all EU member states have "European Union" (perhaps in another language) above the name of the issuing country.
The information page of the passport records basic information about the passport: its bearer's surname, given names, photo and date and place of birth, validity period, issuing authority, place of issue and passport number, and the dates the passport was issued and will expire. Most passports also contain a request for safe passage and right to consul in event of incarceration. Most passports issued in recent years have a machine-readable strip at the bottom of the page to expedite encoding at the relevant stations (see the relevant section below).
In some countries, the next pages are for amendments where the bearer country's issuing may place travel restrictions, change conditions for travel abroad, or amend the period of validity. In addition, pages may be included which provide helpful legal and practical information for the bearer. For instance a US passport contains 6 pages regarding websites and contacts for various reasons (travel restrictions, treasury restrictions on imports, paying taxes while in a foreign country, registering your stay in a foreign country), common sense subjects (don't be a target, be mindful of security threats, ways to lose citizenship), and important information (loss, theft, destruction, alteration, or mutilation of the passport, what to do in a natural disaster or catastrophic event, etc).
Most of the passport pages are allotted for visas where visas coming from different embassies or consulates are pasted. Stamps from passport control officers of both the bearer's home country and countries visited revealing the history of entry and exit of those countries are also found on these pages.
 Extra pages
Some countries, such as the US, allow the addition of extra pages to passports. Some countries require 2 blank pages in your passport before you enter the country. If you are running low on blank pages and have a passport from a country that permits the addition of extra pages, contact your nearest passport office, embassy, or consulate and they should be able to add extra pages for free or a fee depending on the issuing country.
Other countries, such as Canada, can issue a special passport with 48 pages instead of the usual 24 for frequent travellers, Canada does not allow extra pages to be added later, so this is definitely worth doing if you expect to travel a lot. The new E-Passports only have 36 pages which is the only option.
Some countries may issue a new passport "cross-linked" (or even physically bound) to the old one. The old one must have a blank page for the authority to endorse a cross-link. This is useful not only when a passport is running low on blank pages, but also in cases where the visa outlasts the passport that contains it.
It can be possible for a person to hold multiple passports from a single country at the same time, although not all countries allow this and even for those countries where it is allowed, it is something of a rarity. Not everyone, including some immigration officials in more remote places, knows that it is both possible and legal to have 2 or more passports. If you are off the beaten tracks, it is advisable to only show the passports that are needed for that particular border, as multiple forms of the same ID can look suspicious. Instances where 2nd (or even 3rd) passports can be issued include:
 Kinds of passports issued
 Diplomatic passport
As the name implies, this passport is typically issued to diplomats as well as high-level government officials. In some cases, bearers of these passports will have different visa requirements from regular passport bearers.
 Official Passport
This type of passport is generally issued to government employees for work-related travel. These are often treated like diplomatic passports.
 Regular (or tourist) passport
This is the most common type of passport issued. It must meet certain established criteria to be recognised and is allowed for general international travel.
 Internal passport
In some countries (e.g. Russia) a local passport is for citizen's domestic use only; for international travel a regular (tourist) passport should be issued. An internal passport often serves to prevent the flow of persons from one region of a country to another, this is often implemented to prevent residents of a volatile region from spreading their conflict to another region.
 Passport Card
Many Americans cross the Canadian border daily and new requirements require passports to travel to all nations, including Canada and Mexico. The passport card has the same status as the passport book, but in card form for the convenience of frequent border crossing and is only valid for land and sea travel between the United States and Canada, Mexico, and the Caribbean (sea travel only).
If you live in the U.S. states of Michigan, New York, Vermont, and Washington you can also apply for an enhanced driver's license (EDL). From a US standpoint an EDL is functionally the same as a passport card and is routinely accepted for reentry into the United States by land or sea. It should be noted, however, that Canadian authorities do not regard an EDL as proof of nationality, only proof of identity, making an EDL unacceptable for entry into Canada unless presented with a birth certificate or another proof of citizenship.
 Technology and security
Over the years, the way passports are produced have changed. Passports where the front pages are handwritten still exist although they are being phased out due to security concerns.
Increasingly in the 1990s, machine-readable passports have been introduced where the personal data page is automated. That information is also encoded into 2 strips at the bottom of the page. This helps speed-up lines at most passport control stations as the officers don't need to type in most of the entries in their respective fields manually in the computers.
Most nations have implemented biometric passports - containing an RFID (radio frequency identification device) chip which contains (depending on issuing country) an electronic recording of passport data, a photograph, and/or fingerprints. Basically, an RFID station issues a signal, and the RFID chip responds with some or all of its data. They are highly useful for customs and immigration officials to quickly and better identify you.
However, security experts report that the first-generation of these chips can be casually "read" by others as well. This may present a personal security problem for some travellers, e.g., in crowded places, where frequented by those who target certain nationals, e.g., to "con" or rob. If concerned, you might:
 Where/How to apply
Your home country's passport issuing authority
To obtain your first passport, you will have to provide substantial identification with your application. Once you have a passport, almost regardless of when issued, it can often be effectively used to substantiate your identity as you apply for a new one. Usually, each application must be accompanied by one or more recent, clear, head-and-shoulders color photos of a required size for mounting and embossing in the finished document by the passport issuing center.
 What if I lose it whilst travelling?
Most people travelling outside of their home country have not had this problem. But a few people have had a nightmare about losing their passport. In this event, take a deep breath and contact your embassy or consulate immediately to begin the replacement process. It can often take anywhere from a few days to a couple of weeks to get a new passport in a foreign country, depending on your citizenship and your location.
Some countries offer "emergency passports" if you can convince them that you can't wait out the normal turnaround time. These documents usually expire within a year of issue, and often raise eyebrows and slow you down when going through immigration at airports and land borders. They take a much shorter time, often just hours, to obtain than a full-blown replacement passport. The process can be bolstered by having a copy of the original, as discussed below. A police report is useful and may even be required by your embassy/consulate, even if there was no crime involved. Don't forget to bring a couple of passport photos.
 Make Copies
Seasoned travellers often carry multiple machine or photo copies of their passport (and other important documents, e.g., visas) when abroad, stashed in locations separate from the originals, e.g., folded together in their wallet, in their luggage, or even scanned into a computer.
Use original passports when demanded by authorities, e.g., checking in for a flight, at immigration as you reach another country, for cruise ship embarkation processing.
Copies are best done in colour, and at least of the primary page(s) of each original. Two adjacent pages of two passports can often fit on a single sheet of copy paper.
 Giving your passport to others
In some countries hotels are required to keep photocopies of your passport, if you don't want to trust hotel staff with your passport, e.g. if staff have to leave the hotel premises to make a copy, you will be able to provide your own - no need to be overly paranoid, but having staff run across town with a passport worth more than they make in a year, to find the only Xerox in town, might prove too tempting for some people. In any case you should never hand over your passport as a security or guarantee under any circumstances, except as required by law or as a condition of release on bail.
 Expiration and Travel
In practical terms, the last date when you can use a passport is well before the expiration date. As you start international travel, most "public carriers" (e.g., cruise lines) will demand that your passport have considerable time before it expires...typically six months. They are helping to ensure that you won't violate the laws of countries you'll visit. You may have to stay longer than planned, e.g., due to serious injury or illness. Overstaying your passport or a visa can be serious.
If your passport fails to have enough time before expiring, you may be denied boarding.
Passports from many countries (Australia, EU nations, US ...) remain valid for 10 years or 5 Years for people who renewed/gotten their passport as an minor, depending on country and the applicant's age if he/she is an minor. In the US, you are an minor when you are under 16 while others are under 18. Other passports, such as Canadian, only for five. In any case, they will expire, and if not used occasionally, you may forget. Issue of a new passport can take as long as 3-4 months, perhaps less if you arrange special-handling through a commercial expediter for a fee. Stay aware to avoid great disappointment.
 Other Restrictions
A passport may be treated as a privilege to citizens of the said country. This means the citizen concerned may be required to surrender it to local authorities at certain times such as when they are subject to criminal investigation. Moreover, some passports issued by some countries may expire earlier than usual, and this may indicate that the holder is nearing the required age for conscription.
In some cases, countries with poor or no diplomatic relations may bar the bearers of the other country's passport (or merely having stamps of that other country) from seeking entry. This is the case, for instance, with Israeli passport holders, and sometimes those with just an Israeli stamp, who are usually not permitted to enter most Arab/Islamic states.
For people with dual citizenship remember to be careful about the following issues:
 See also