"A comparison shopping website, sometimes called a price comparison website, comparison shopping agent, shopbot or comparison shopping engine, is a vertical search engine that shoppers use to filter and compare products based on price, features, and other criteria. Most comparison shopping sites aggregate product listings from many different retailers but do not directly sell products themselves. In the United Kingdom, these services made between \u00A3780m and \u00A3950m in revenue in 2005."@en .