As I saw that nobody has written a review of Nestles KitKat I decided that this high-responsibility job had to be done by someone. Might just as well be me...
KitKats are chocolate with biscuit inside. This is probably the most simple, and arguably elegant, version of the candy bar. A kitkat is either 2 or 4 little bars of biscuit next to eachother covered in milk chocolate. The milk chocolate connects the bars of biscuit, so that you can break one of the four bars off.
Theres not realyl a lot to tell about them, theyre quite plain, but good if you havent got access to something better. You can also use the pary-bag (lots of small kitkats in a bag) for treats at birthday parties or other cheerful events.
The average gas station sells them, I think... been a while since I checked if theyre still sold in gas stations...