Affiliate links are another way to advertise or be advertised.
Affiliate links are also a great way to earn micro payments or income, if you have a reasonable amount of traffic to your site.
Some companies or websites will give out a percentage and others will give a flat rate for referring their product or service, but they will always let you know.
One of the reasonable payouts I’ve seen is by DX.com for their affiliate program.
An affiliate link is a specific URL that contains the affiliate’s ID or username. In affiliate programs, advertisers use affiliate links to record the traffic that is sent to the advertiser’s website.