The WB visa category is for short-term business or tourism visits under the Visa Waiver Program. Applicants must have an approved ESTA, an electronic passport, and be citizens of eligible countries. Visits are limited to 90 days, and no change of status is permitted while in the United States. The ESTA fee is around $21. The process is easy for eligible applicants, and visa agency involvement is necessary. Processing times range from minutes to days. Approval rates are high, though ESTA denials require applicants to pursue a B visa instead.