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You must be a citizen of a Visa Waiver Program-eligible country in order to use this program. Permanent residents of VWP-eligible countries do not qualify for the Visa Waiver Program unless they are also citizens of VWP-eligible countries. It is recommended you visit the U.S. Department of State website before planning any travel to the U.S. to determine if you are eligible for the VWP.
In addition, green card holders and certain other aliens must obtain a certificate of compliance (also known as a "sailing permit" or "departure permit") from the Internal Revenue Service proving that they are up-to-date with their US income tax obligations before they may leave the country.[114] While the requirement has been in effect since 1921, it has not been stringently enforced, but in 2014 the House Ways and Means Committee has considered to begin enforcing the requirement as a way to increase tax revenues.[115]
Having a U.S. visa allows you to travel to a port of entry, airport or land border crossing, and request permission of the Department of Homeland Security (DHS), Customs and Border Protection (CBP) inspector to enter the United States. While having a visa does not guarantee entry to the United States, it does indicate a consular officer at a U.S. Embassy or Consulate abroad has determined you are eligible to seek entry for that specific purpose. DHS/CBP inspectors, guardians of the nation’s borders, are responsible for admission of travelers to the United States, for a specified status and period of time. DHS also has responsibility for immigration matters while you are present in the United States.

^ Calder, Simon (24 April 2017). "Airline lobbying for a relaxation of draconian rules for London-Auckland travellers". The Independent. Retrieved 7 July 2018. Travellers heading west from the UK to New Zealand may soon be able to avoid the onerous requirement to clear US border control during the refuelling stop at Los Angeles airport (LAX). Unlike almost every other country in the world, the US insists on a full immigration check even for travellers who simply intend to re-board their plane to continue onwards to a foreign destination. Air New Zealand, which flies daily from Heathrow via Los Angeles to Auckland, says there are currently “strict requirements for travellers” in transit at LAX. Through passengers to Auckland on flight NZ1 or Heathrow on NZ2 must apply in advance for an ESTA (online visa) even though they have no intention of staying in the US. They also have to undergo screening by the Transportation Security Administration.
Certain foreign maritime workers are eligible to apply for a Transportation Worker Identification Credential (TWIC) once in the U.S. If you, as a maritime industry worker, will perform services in secure port areas, your visa must be annotated “TWIC Letter Received.” Workers whose visas are not annotated will not be permitted by the Transportation Security Administration (TSA) to apply for a TWIC. 

An ASEAN common visa scheme has been considered with Thailand and the "CLMV" countries of Cambodia, Laos, Myanmar and Vietnam opting in earlier. After talk arose of a CLMV common visa,[91] with Thailand being omitted, Thailand initiated and began implementation of a trial common visa with Cambodia, but cited security risks as the major hurdle. The trial run was delayed,[92] but Thailand implemented a single visa scheme with Cambodia beginning on December 27, 2012, on a trial basis.[93]
^ LIPTON, Eric (15 December 2006). "Administration to Drop Effort to Track if Visitors Leave". The New York Times. Retrieved 25 April 2019. Efforts to determine whether visitors actually leave have faltered. Departure monitoring would help officials hunt for foreigners who have not left, if necessary. Domestic security officials say, however, it would be too expensive to conduct fingerprint or facial recognition scans for land departures.
The United States has several visa restrictions that affect whether a potential visitor is granted a tourist visa. Visa applications may be denied on the grounds of health, a criminal record or other security reasons. For example, anyone with a significant communicable disease or a physical or mental health disorder that poses a safety threat will not be allowed entry into the US.
Some types of visa like B1 may not expire with the expiry of the holder's passport. An unexpired, endorsed visa in an expired passport may be presented for entry into the USA, as long as the visa itself has not been cancelled, is undamaged, is less than 10 years old and is presented with a valid non-expired passport, provided that both passports are for the same nationality.
Entering a country without a valid visa or visa exemption may result in detention and removal (deportation or exclusion) from the country. Undertaking activities that are not authorised by the status of entry (for example, working while possessing a non-worker tourist status) can result in the individual being deemed liable for deportation—commonly referred to as an illegal alien. Such violation is not a violation of a visa, despite the common misuse of the phrase, but a violation of status; hence the term "out of status".
A visa allows a foreign citizen to travel to a U.S. port-of-entry (generally an airport) and request permission to enter the United States. A visa does not guarantee entry into the United States. The Department of Homeland Security (DHS), U.S. Customs and Border Protection (CBP) officials at the port-of-entry have authority to permit or deny admission to the United States. If you are allowed to enter the United States, the CBP official will provide an admission stamp or a paper Form I-94, Arrival/Departure Record. Learn more about admissions and entry requirements, restrictions about bringing food, agricultural products, and other restricted/prohibited goods, and more by reviewing the CBP website.
To circumvent this Arab League boycott of Israel, the Israeli immigration services have now mostly ceased to stamp foreign nationals' passports on either entry to or exit from Israel. Since 15 January 2013, Israel no longer stamps foreign passports at Ben Gurion Airport, giving passengers a card instead that reads: "Since January 2013 a pilot scheme has been introduced whereby visitors are given an entry card instead of an entry stamp on arrival. You should keep this card with your passport until you leave. This is evidence of your legal entry into Israel and may be required, particularly at any crossing points into the Occupied Palestinian Territories." [135] Passports are still (as of 22 June 2017) stamped at Erez when travelling into and out of Gaza. Also, passports are still stamped (as of 22 June 2017) at the Jordan Valley/Sheikh Hussein and Yitzhak Rabin/Arava land borders with Jordan.
Azerbaijan also strictly bans any visit by foreign citizens to the separatist region of Nagorno-Karabakh[138] (the de facto independent Republic of Artsakh), its surrounding territories, and the Azerbaijani exclaves of Karki, Yuxarı Əskipara, Barxudarlı, and Sofulu which are de jure part of Azerbaijan but under the control of Armenia, without the prior consent of the government of Azerbaijan. Foreign citizens who enter these territories will be permanently banned from entering the Republic of Azerbaijan[139] and will be included in their "list of personae non gratae".[140] As of 21 February 2019, the list mentioned 803 people. 

A visa or travel visa is a document which gives someone permission to travel into a specific country and stay there for a set period of time. They may be stamped or glued directly into a passport for convenience, or they may be issued separately, in the form of documents which must be carefully protected to ensure that they are not lost or stolen. Some nations require everyone who enters to get a visa, while others have what are known as reciprocal agreements with certain nations which waive such requirements. It is important to research visa requirements before traveling internationally, as in some cases travelers must apply before they attempt to cross a border.