P= Personal
D= Digital
A= Assistant
Basically, it's like a "sub-computer" if you will (like a comp. only it doesn't have everything, and smaller), and an organizer. There are 2 OS (operating system) for it, as far as I know: Palm OS and Pocket PC. Pocket PC more resembles a comp than Palm OS. It has the little start menu bar, it has Pocket Word and Excel, I think it's got some games, and some other things you would find on a comp.
