In Internet marketing, reach is how many different people visit a Web site to see an ad and also what percentage of these people fall into the audience to which an ad is targeted. A common measure of reach for a Web site is its "unique visitors per month." For example, assume an advertising banner campaign was targeted to car owners. On a Web site visited by 100,000 unique visitors a month where 90% of the audience owned a car, an ad running on such the site would reach 90,000 different car owners in a one-month run. The term is used in other advertising media as well as on the Web.
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