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. 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.
For another thing, the Internet has somewhere in the neighborhood of two decades worth of traffic bot programs littering the digital ground. Some have gone through upwards of a dozen name changes and rebrands, moving from one site to another. They disappear, leaving existing users in the lurch, never to receive support or updates when the program stops working. Then identical software comes out under a new name, charging anywhere from $5 to $250, scamming people out of their cash with the same back-end software.
There are several types of affiliate programs. Most will pay you a flat rate or percentage of the sale you make (pay-per-sale). Another common type is when you're paid per action or lead. For example, if you refer someone who signs up for businesses free trial, the business pays you for the sign-up. Although not seen as often anymore, some will pay you per click (this is seen most in contextual ad programs such as Google Adsense) or per impression (each time the ad is loaded on your website).
When it comes to traffic for sales or leads it varies from industry to industry and country to country, on the top of that it requires other complex process that are suitable only for the advanced paid traffic masters. In this article I will be discussing traffic for branding and improving rank on several web metrics which are responsible for judging the quality of a website such as Alexa rank, Similarweb Rank, Domain Rating, WOT Rank and so on.