What Is a Visa? | What Is a Travel/Tourist Visa? | What Is a Work Visa? | What Is a Business Visa? | What Is a Student Visa? | What Is a Refugee/Asylum Visa? | What Is a Working Holiday Visa? | What Is a Spousal Visa? | What Is a Transit Visa? | What Is an eVisa? | Immigrant Vs. Nonimmigrant Visas | What Does a Visa Look Like? | Why Do I Need a Visa to Travel? | What Is a Visa Policy? | Why Do Certain Countries Have Visa Restrictions? | When Do I Need a Visa? | How Do I Apply for a Visa? | What Are the Requirements for a Visa? | What Are the Supporting Documents Required for Visitor Visas? | What Is an Invitation Letter for a Visa? | What to Expect During a Visa Interview? | What Are the Fees for Obtaining a Visa? | What Are Visa Processing Times? | What Visa Services Does an Embassy Offer? | What Can I Learn From the Visa Restrictions Index? | Which Countries Can I Travel to Visa-Free? | How Are Travel Visas Linked to My Passport? | Visa-Free Vs. Visa on Arrival Vs. Visa Required | What Are the US Visa Restrictions? | Which Countries Can I Visit Visa-Free With the US Passport? | How Many Visitor Visas Does the US Accept and Reject Each Year? | Which Countries Can I Visit With a Schengen Visa? | When Was the First Visa Ever Issued? | Global Visa Issuance Over Time
A visa does not guarantee entry into the United States, but allows a foreign citizen coming from abroad to travel to a U.S. port of entry and request permission to enter the United States. The Department of Homeland Security, U.S. Customs and Border Protection (CBP) officials have authority to permit or deny admission to the United States, and determine how long a traveler may stay. At the port of entry, upon granting entry to the United States, the Customs and Border Protection officer will stamp your travel document with the date of admission, the class of admission (i.e. VWP traveler, or the visa classification for visa holders, or other permissible class of entry), and the date that you are allowed to remain until, that is the date by which you must leave the United States. You can review information about admission on the CBP website. The Department of State's Consular Affairs website has more information about duration of stay.