Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. On the internet, a price comparison service (also known as shopping comparison or price engine) allows individuals to see different lists of prices for specific products. Most price comparison services do not sell products themselves, but source prices from retailers from whom users can buy. In the UK, these services made between 120m and 140m in revenue in 2005, and is growing at an annual rate of 30% to 50%. The internet boom of the late 1990s made price comparison profitable. Price comparison services were initially implemented as client-side add-ins to the Netscape and Internet explorer browsers, and required that additional software be downloaded and installed. After these initial efforts, comparison shopping migrated to the server so that the service would be accessible to anyone with a browser. Services which are now offered by websites dedicated to price comparison and by major portals.

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