UPS is one of the best-known freight and delivery companies in the United States, responsible for handling millions of packages each year with postal service-like delivery. Alongside home delivery, UPS also operates air freight services and retail store locations where customers can ship items or buy shipping supplies. With about half a million employees worldwide, the company is a frequent choice for those seeking a job, especially on a seasonal basis. When those apply, they must undergo the UPS background check process.