You might notice that when you have been browsing a website looking for something, (for example, a pair of shoes), then you will start to see ads for those shoes when you're browsing the internet. The reason this happens is the cookies on your computer. Alternatively, you clicked 'yes' when you got asked if you wanted the website to remember your username and password.
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.