A personal digital assistant (PDA) is a mobile device falls between mobile phones and netbooks and can be known as a palmtop computer. Today the vast majority of all PDAs are smartphones, selling over 150 million units while non-phone ("stand-alone") PDAs sell only about 3 million units per year. The BlackBerry, the Apple iPhone and the Nokia N-Series are typical smartphones.
Smartphones with GPS capabilities are increasingly popular in the business sector, as they function as a mobile phone, PDA, internet connection, and GPS unit. You can view documents from your PC and check email – all while following turn-by-turn directions to your lunch meeting.