[Q] Android Starter?

Hi everyone i got a few questions on Android terms:

I google much and i know what ROMS and rooting are but still,

1. What is KE7 that everyone keeps talking about? is it a ROM?
2. What is the stock ROM for a Galaxy SII ?
3. Is a customized ROM such as cm7 usually gonna change the whole user interface? or just modifiy the original UI?
If so, wouldnt a launcher such as ADW launcher be unnecessary as it already has modified your UI?
4. What is a kernal?

Thanks a lot guys

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