Affiliate marketing overlaps with other internet marketing methods to some degree, because affiliates are using the same methods as most of the merchants themselves do. Those methods include organic search engine optimization, paid search engine marketing, email marketing and to some degree display advertising.
Affiliate marketing - using one site to drive traffic to another - is the stepchild of online marketing. While search engines, e-mail and RSS capture much of the attention of online retailers, affiliate marketing, despite lineage that goes back almost to the beginning of online retailing, carries a much lower profile. Yet affiliates continue to play a fundamental role in e-retailers' marketing strategies.