When i think of interfaces, i recall being told to think about how and why a DVD works.<p>The DVD would have been manufactured by a factory somewhere in china, by a bunch of people who does not know you. And yet, the DVD fits perfectly, on a drive that you bought, probably manufactured in the United States, by people who does not know you, nor the DVD manufacturer.<p>The software to read the DVD is written by yet another set of people, in yet another country, all of whom would not have talked to any parties mentioned above. And yet, the DVD is read perfectly, with error correction to adjust for any minor scratches.<p>The DVD plays video and audio data, created by people (probably in hollywood) who also have not met any of the parties above. And yet, it reproduces the sound and audio completely correctly as the original directors&#x2F;composers intended.<p>And all of this, costs less than 50c a piece, with a drive that could be bought for less than $30.<p>That is the power of interfaces.