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In many countries, the Yellow Pages refers to a telephone directory for businesses organized by the category of product or service. As the name suggests, they are usually printed on yellow paper, as opposed to white pages with non-commerical listings, printed on white paper. With the advent of Internet, the traditional term "Yellow Pages" became applied to online directories of businesses. The Name and Concept "Yellow Pages" were invented in the USA over a century ago. The expression "yellow pages" is used all around the World in both English and Non-English speaking countries.Yellow Pages directories are usually published annually and distributed for free to all residences and businesses within a given coverage area. The majority of listings are in plain small black text. Yellow Pages publishers make their profits by selling special value-added features to businesses such as a larger font size for their listing, or an advertisement box next to the listings in a category. Since the mid-1990s, there has been a trend among Yellow Pages publishers to add four-color printing for some advertisements. Many publishers also offer the option to have advertisements appear with a white background to make them stand out more. Interestingly, most yellow pages are not printed on yellow paper; rather the yellow is printed onto the paper. When an advertisement is printed with a white background, its part of the page does not receive yellow ink - so the white is actually the natural color of the paper.
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