What does it mean to become an affiliate of a website or product?

I was on the cingular website and a saw a link at the bottom where it I can become an affiliate of cingular for free.....what does this mean?

You can check out this page:

http://www.affiliatemarketinglessons.com/report.html

This is part of a 12 part report that I created, which basically highlights what I have learnt as an affiliate marketer.

You can access the report at:

http://www.affiliatemarketinglessons.com/

Hope this helps...

You can promote them and get money for doing so..