how does pixel tracking work?

I was trying to get information about this from my CPAEmpire AM and she mentioned this. I saw some video of a guy appending "?subid=" and that was what I was trying to get more information on.

So i figure a pixel is a 1x1 px that I create on my landing page? So theres a unique pixel created for every offer i want to create?

When you have an image on your webpage, the surfer's browser will send some information to the webserver hosting the image (to request that image). This request looks like:

If your file track.gif on your site is a PHP script instead of a GIF image, you can record the information that is send in the request (including the subid parameter and the ip of the surfer) and still output a valid 1x1 px image.

I hope that answers your question.

when someone talk about pixel he can refer to adwords pixel, you have to ask to your affiliate manager put the adwords pixel in the offer that you are promoting