History
From the beginning of humankind people have felt the urge to protect what they possess. They start by covering the entrance of their caves with stones; later they hid their gold and jewels in the ground.
Then they discovered locks. These were first made of wood and rope. They served the purpose well, although they were not so nicely designed. There is a lot of historical proof which certifies the use of locks long before we could imagine. Even in the Bible (Old Testament, Books of Judges) we have frequent mention of locks and keys.
Types
In modern society we have keys and locks for everything: the house, the office, the car, the bike. We even have more than one key for the same building; keys and locks are so much a part of our daily routine that we don’t take them into consideration (or maybe we do that only when the ring of keys is too heavy to be placed in our pockets).
But we do give a lot of thought when we have to pick the type of lock or the type of key. Basically we are talking about mechanical locks (based on mechanical activation of the keys) electro-mechanical locks (can be both mechanical or electrical activated, but...
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