Personal digital assistants (PDAs) are handheld computers that were originally designed as personal organizers, but became much more versatile over the years. PDAs are also known as pocket computers or palmtop computers. PDAs have many uses: calculation, use as a clock and calendar, accessing the Internet, sending and receiving E-mails, video recording, typewriting and word processing, address books, making and writing on spreadsheets, listening to music, playing computer games, and
Global Positioning Systems (GPS). Newer PDAs also have both color screens and audio capabilities, enabling them to be used as
mobile phones, web browsers, or portable media players. Many PDAs can access the Internet, intranets or extranets via Wi-Fi, or Wireless Wide-Area Networks (WWANs). One of the most significant PDA characteristics is the presence of a touch screen, popularized by
Palm. Other manufacturers have revolutionized the PDA, such as
Hewlett Packard (HP),
Samsung and
Nokia.
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