Whats a kernel?

[poof101]

I want to download Wireless Tether for my Droid X...the requirments are a root and a kernel..my phone is rooted, but i have no idea what a kernel is and if i have it already

 

[Tobii1]

http://en.wikipedia.org/wiki/Kernel_(computing)

YouTube - How to get FREE Wifi Tether on your Droid X!