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Advances in information technology have led to the accessibility of large data sets to commercial enterprises. The use of bar codes in commercial outlets, the computerization of business transactions, and the explosion of e-businesses are providing a flood of data to consumers and corporations. This creates an unprecedented opportunity to analyze this data and extract intelligent and useful information, or, as it is often referred to, data mine. For years, companies have deployed data mining to boost sales. Amazon.com, for instance, is an online warehouse that offers books, CDs, movies, toys, apparel and electronics to internet-savvy shoppers. As one of the most innovative pioneers of e-business, Amazon.com builds high-tech systems that carefully filter their vast customer database.
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