You can make it shorter to remember, attractive to click or you want to hide the link (to avoid people directly type on their address bar the main link such http://someaffiliate.net rather than click directly to http://someaffiliate.net/?ref=2we3ere32wer432we3).
We will use cloacking url then. it will hide your long and main link.
- open http://tinyurl.com/
- insert your affiliate link into the box and click “Make TinyURL!”
it will give something like http://tinyurl.com/3rt45. easy right! this will give persuasive campaign of your affiliate program.
Have a nice try