Generally, a citizen of a foreign country who wishes to enter the United States must first obtain a visa, either a nonimmigrant visa for a temporary stay, or an immigrant visa for permanent residence. Visitor visas are nonimmigrant visas for persons who want to enter the United States temporarily for business (visa category B-1), for tourism (visa category B-2), or for a combination of both purposes (B-1/B-2).
Previously, foreign travelers granted entry by CBP officials received a paper Form I-94 (Arrival/Departure Record). This process is now automated, with some exceptions. If you received a paper Form I-94 or I-94W and failed to turn in your paper Form I-94 Arrival/Departure Record to the commercial airline or CBP when you departed the U.S., see the CBP Website for instructions. Do not send your paper Form I-94 or I-94W to the U.S. Embassy or Consulate General.
With some countries, the validity of a visa is not the same as the authorised period of stay. The visa validity then indicates the time period when entry is permitted into the country. For example, if a visa has been issued to begin on January 1 and to expire on March 30, and the typical authorised period of stay in a country is 90 days, then the 90-day authorised stay starts on the day the passenger enters the country (entrance has to be between 1 January and 30 March). Thus, the latest day the traveller could conceivably stay in the issuing country is 1 July (if the traveller entered on 30 March). This interpretation of visas is common in the Americas.
Finding that an entry visa to the United States has been granted is cause for great celebration for most applicants, but that celebration is often premature: Visas allow travelers to board their transportation to the U.S., but they by no means guarantee entry. You cannot stay in the U.S. at all with a visa alone. Determining officers of the Department of Homeland Security at the U.S. port of entry are empowered to turn away even people with visas and send them back where they came from if they sense some subterfuge or illegal intent.
In the event the PPEF was not included in a ticket issued on or after January 1, 2018, it shall remain the responsibility of the airline to transmit the appropriate fee per arriving passenger to the National Treasury. For any tickets sold prior to January 1, 2018, with the passenger arriving and/or departing after January 1st, the BCBP shall continue to collect and charge the same fees totalling Fifty Dollars ($50 USD) upon departure for any airline passenger who arrived in the Republic of Palau prior to the PPEF implementation date and is departing on a ticket purchased before January 1, 2018. The amount collected upon departure in this situation shall be a Thirty Dollar ($30 USD) “Green Fee” and Twenty Dollar ($20 US) departure tax for a total of Fifty Dollars ($50 USD) for every non-Palauan passport holder. Such passenger must provide a copy of their ticket and any other supporting documentation as required.