Many businesses and government institutions use a content filtering program such as Websense to keep employees from visiting certain websites while at work. These programs can either prohibit the use of certain websites or monitor all of the sites that employees do visit while in the office. Websense is designed to block websites in several categories, such as adult material, entertainment, drugs, games, sports, internet communication, peer-to-peer file sharing, gambling, instant messaging, health, illegal, shopping, job search, internet telephony, religion, special events, travel, violence, weapons, advertisements, freeware and software download, pay-to-surf, malicious websites, and many more.