Posted: 2:21 am ET
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Nonimmigrant visas are used for travel to the United States on a temporary basis. Click here for the categories of nonimmigrant visas. Note that visas are used to make application to enter the United States. The validity of the visa is not a permit to stay.  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 are responsible for admission of travelers to the United States, for a specified status and period of time.

Via state.gov:

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