Google Adwords can be used to drive targeted traffic to a sales page. You simply make an ad in your adwords account then use your affiliate link in the target page URL of the ad. Obviously, you will have to continuously measure the conversions and see if the campaign cost is less than the campaign profit in order to keep the campaign running but I am sure you get the idea.
The affiliate marketing industry is growing steadily. An independent survey commissioned by Rakuten Affiliate Network found that affiliate marketing is set to reach $6.8 billion by 2020. Ninety percent of advertisers included in the survey said that affiliate programs were important or very important to their overall marketing strategy, with the majority of publishers reporting that affiliate partnerships drove more than 20% of annual revenue.
Affiliate marketing is often touted as a "get rich quick scheme" by shady sites offering pyramid schemes that promise quick cash for little effort. Make no mistake—successful affiliate marketers like Pat Flynn of Smart Passive Income put in a lot of effort toward building an audience and creating quality content that will bring in sustainable passive income. Expect to do a lot of legwork up front—but if you play your cards right, you can build a solid source of revenue over time.