@@Easy-LifeHacks 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). Depending on your nationality, visas can be issued from a single entry (application) up to multiple/unlimited entries. A visa issued for a single entry (denoted on the visa under “Entries” with the number 1) is valid, or can be used from the date it is issued until the date it expires to travel to a U.S. port-of-entry one time. A visa issued for multiple entries (denoted under “entries” with a certain number (2, 3, etc.) or “M” for multiple/unlimited entries) is valid, or can be used from the date it is issued until the date it expires to travel to the U.S. port-of-entry as many times as your visa states, provided that: Applying for a new visa is not necessary if your visa has not expired and you have not exceeded the number of entries permitted on your visa. Multiple uses of a visa must be for the same purpose of travel allowable on the type of visa you have. 更に情報欲しいならググってください。 確かに某有名人犯罪履歴があるため、最初は単発のビザ、その後一年、三年更新していた情報もありますよー日本人でも逮捕履歴がある場合ESTAでは米国入国できません。