This is known as affiliate marketing. The biggest brands in the world all offer affiliate programs (eg. Amazon, eBay, Expedia), while many of the world’s biggest websites use affiliate marketing to pay the bills.
That means we use a special link unique to each webmaster to track referrals. Here are some real-life examples…
http://bluehost.com/track/qualitynonsense/ is a BlueHost affiliate link
http://justhost.com/track/qualitynonsense/ is a JustHost affiliate link
Sometimes, a naked link works too, if the webmaster and the webhhost have a special agreement.
Once you land at their website, they make a note that we sent you using cookies & similar methods. If you spend money, they’ll pay us a referral fee.