Affiliate advertising is basically an online marketing channel. An advertiser pays a blogger to promote the advertiser s products or services on the blogger's site. There are three main types of affiliate ads: pay-per-click, pay-per-lead and pay-per-sale. Each of these affiliate ad types has one thing in common. They are all performance based meaning you don t earn money until your readers perform an action such as clicking on a link or clicking on a link then purchasing the product on the page to which the link brings them.