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It would be easier to draw the answer but I will try with words. Assuming you mean the notches on the top: Keyed locks use what are called tumblers. These are small bars that come down within the lock and keep the lock from turning. The tumblers fit through spaces of various heights such that, when the tumblers are all at the right height, the lock can be turned (unlocked). When you slide a key into the lock it pushes the tumblers up. If the key had not been cut (i.e. had no notches) then it would push all the tumblers to the same height, they would not match the spaces and the lock would not turn. The notches are cut into the key to match the heights at which the tumblers need to be in order to turn. I hope that makes sense. So when you pick a lock, you put in one tool that is strong and can make the turning motion and another tool to lift the tumblers up to their proper heights. A key with a cut much different than the lock will not slide into the lock because it jams against the tumblers (or stops due to the grooves in the side of the key being in the wrong place). The notches (I would say grooves) on the side, limit the number of keys that can be slid into any particular lock.

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