Online advertising started to take shape – Cost Per Mille (CPM) models and paid placements were important components of the marketing mix, but difficult to measure. An emphasis on quality traffic and conversion helped transition marketers from buying impressions and site visitors, to paying exclusively for traffic that resulted in a sale and affiliate marketing lead the charge.

Affiliate marketing overlaps with other Internet marketing methods to some degree, because affiliates often use regular advertising methods. Those methods include organic search engine optimization (SEO), paid search engine marketing (PPC – Pay Per Click), e-mail marketing, content marketing, and (in some sense) display advertising. On the other hand, affiliates sometimes use less orthodox techniques, such as publishing reviews of products or services offered by a partner.[citation needed]
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