PDA's are everywhere these days. They can be used for keeping track of homework due dates, phone numbers, little brother's soccer games, or anything else that one could dream up. They are much like a personal planner that included...pencil and paper! Remember those? A PDA takes the main idea behind those and "digitizes" them to a point that they are "electronically correct." Not only that, but some of the models include a plastic pencil (called a stylus) that is used to input information into the PDA. There are literally thousands of models of PDA's and along those thousands of models come thousands of prices, ranging from 100 US dollars through as much as one would wish to pay for one.
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