We recently wrote about the best ways you could make money off of your blog and mentioned that taking part in affiliate programs were one of the most popular and easiest methods. Affiliate marketing in a nutshell allows you to earn a commission every time a reader clicks one of your links or uses your promo code to purchase a product on another business' site.
This affiliate link you receive upon signing up is unique and is usually tracked by cookies. 'Cookie length' or 'cookie life' in affiliate marketing is basically the duration that your commission will be tracked. So if a cookie has a 30-day life, even if your reader doesn't purchase a product right away, you will still receive a commission if your reader comes back within 30 days to make their purchase.