Interoperability Metaphore
Car pedals are standardized.
The order is always, from left to right, clutch, brake, gas.
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Imagine if a new car company created the following pedal order:
Or even the following:
The results would be disastrous. The same concept applies to software and file types. If the software knows how to read a file, everything is fine. If the software is used to another type of file, however, it will read the file wrong, and computer disaster occurs.
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