Classified advertising is a form of advertising, which is particularly common in newspapers and other periodicals. Classified advertising is usually textually based and can consist of as little as the type of item being sold, (i.e., "Clothing") and a telephone number to call for more information ("call 555-7777"). It can also have much more detail, such as name to contact, address to contact or visit, a detailed description of the product.
In 2003, the market for classified ads in the United States was $15.9 billion (newspapers), $14.1 billion (online) according to market researcher Classified Intelligence. The worldwide market for classified ads in 2003 was estimated at over $100 billion (sources from wiki).
As the online classified advertising sector develops, there is an increasing emphasis toward specialization. Like search engines, classified websites are often vertical in nature with sites providing advertising platforms for niche markets of buyers of sellers.
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