Isn't there a sticky about shaders on this forum? Very briefly, a shader is something that does work in a video card. We used to have seperate shaders/work units until DX10. (DX10 doesn't require you to use unified shaders, but it makes much more sense to do that.)
BTW, keep in mind that because AMD and Nvidia went different routes with their shaders, you can't just say that AMDs 320 shader card must be more powerful then Nvidia's 128 shader card. The amount of work each companies shader can do varies, and they aren't 100% comparable.
Thanks, i am very new to computers so i don't understand a lot of the jargon, i thought it would be easier for me to understand if i had someone explain exactly what it was and if i had any questions i could easily ask them. As i am sure you know finding very specific pieces of info anywhere on the web can be very difficult!!!
OP, you are lazy, it's not that difficult if you really care.
Difficult was having to bike down to your local crappy & poorly funded library, look in a card catalogue for a computer / tech term and then translate the only books / articles on the subject that were published 5+ years earlier into something relevant to your current situation.
THAT's HARD !!!
The .net is easy, you just need to figure out how to use it.
Here's some easy first steps for you and others drawn here since this has now become a Google magnet;