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An impression (in the context of online advertising) is when an ad is fetched from its source, and is countable. Clicking or not is not taken into account.〔(Yahoo Search Marketing Glossary )〕 Each time an ad is fetched it is counted as one impression.〔(Google AdWords Help: Impression )〕 Because of the possibility of click fraud, robotic activity is usually filtered and excluded, and a more technical definition is given for accounting purposes by the IAB, a standards and watchdog industry group: "Impression" is a measurement of responses from a Web server to a page request from the user browser, which is filtered from robotic activity and error codes, and is recorded at a point as close as possible to opportunity to see the page by the user.〔(IAB Glossary of Interactive Advertising Terms v. 2.0 )〕〔(Interactive Audience Measurement and Advertising Campaign Reporting and Audit Guidelines )〕 == Purpose == Counting impressions is the method by which most Web advertising is accounted and paid for, and the cost is quoted in CPI (cost per impression). (Contrast CPC, which is the cost per click and not impression-based). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Impression (online media)」の詳細全文を読む スポンサード リンク
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