Back in mists of time when automobiles first appeared on the roads instead of horses, their keys were basic at best, or more often did not exist at all. Early vehicles were open-topped and just had an ignition switch, as theft was never thought of as an issue then. In fact, potential thieves probably could not drive those cars in the first place, and there were so few around that their presence was obvious and most people knew the 'real' driver! Nothing changed much right up until the end of the 20th century. By then, cars mostly were fitted with locks that were similar to those on house doors, though rather less complex.
The revolution involving car keys came a mere handful of years ago. The turning point was when manufacturers started to look at fitting central locking to cars. Allowing all the doors to be locked or unlocked from one point, this system was the natural follow-on from the introduction of electronics into vehicle systems. Since that point, massive advances have been made - and at a rapid pace. Electronic vehicle systems hit the headlines with the changes resulting from the invention of the computer chip, and makers rapidly took advantage of the miniaturization these devices made possible. Combining computer chips with the power of radio-wave technology finally gave vehicle designers to potential to offer systems where the key and the car could interact to perform various functions.
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