Affiliates were among the earliest adopters of pay per click advertising when the first pay-per-click search engines emerged during the end of the 1990s. Later in 2000 Google launched its pay per click service, Google AdWords, which is responsible for the widespread use and acceptance of pay per click as an advertising channel. An increasing number of merchants engaged in pay per click advertising, either directly or via a search marketing agency, and realized that this space was already occupied by their affiliates. Although this situation alone created advertising channel conflicts and debates between advertisers and affiliates, the largest issue concerned affiliates bidding on advertisers names, brands, and trademarks.[35] Several advertisers began to adjust their affiliate program terms to prohibit their affiliates from bidding on those type of keywords. Some advertisers, however, did and still do embrace this behavior, going so far as to allow, or even encourage, affiliates to bid on any term, including the advertiser's trademarks.
The other things you want to pay attention to are these little icons. If you hover over them, they actually explain them. It basically shows the language, whether it’s one-time billing, recurring billing, or both, so if you see both icons it’s both; whether they have a $1 trial, which is a feature that not all products in Clickbank have, whether there is PitchPlus, which is basically an up-sell, and finally, whether or not they have basically a separate HopLink target URL, which is your affiliate link that can bring people to a mobile-optimized page. You can have your regular HopLink which will take people to the general sales page, or if they have this special one, it means they have a link that will go directly to a page that’s designed for mobile devices. This isn’t really crucial unless you have a lot of people that use mobile devices, plus more and more sales pages are responsive, so you don’t really have to worry about this.
This is the standard affiliate marketing structure. In this program, the merchant pays the affiliate a percentage of the sale price of the product after the consumer purchases the product as a result of the affiliate’s marketing strategies. In other words, the affiliate must actually get the investor to invest in the product before they are compensated.
When promoting affiliate offers, just make sure you are fully aware of all the terms and conditions attached to your affiliate program. Some programs can be strict about how they allow you to promote their products. For example, some may limit you to banner ads and links only, while others will allow you to use paid advertising, but won't allow email marketing. 
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