Your nonimmigrant visa issued by a U.S. embassy or consulate is attached to your passport, and is similar to the sample visa below:
Your nonimmigrant visa page contains important information about you and your visa. You need to make sure that your name, birth date and passport number are correct. If there is an error, or if you have questions regarding your visa, contact the embassy or consulate that issued your visa as soon as possible. Correct any error or mistake on the visa before your travel to a U.S. port of entry (POE).