iPhone and iPod touch’s keyboard
 has predictive mapping

The iPhone and iPod touch’s keyboard has a built-in dictionary that predicts what words you are about to type. Using these predictions, the keyboard readjusts the size of the “tap zones” of letters, making the ones that you are most likely to type bigger and making the letters that are less likely to be typed smaller. The keys themselves don’t get bigger—just the tap zones.

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