A handheld device that acts as a mini-computer. A PDA functions as a personal organizer and usually contains appointments, to do lists, and contact information for friends and associates. Most PDAs use a stylus and a touch screen for input, although some have small keyboards. The Palm with its own proprietary operating system was the first highly successful PDA, and it is still popular today. The Palm licenses its operating system to other manufacturers for use on their PDAs like the Handspring Visor and the Sony Clié.

Other popular PDAs are based on Microsoft’s Pocket PC operating system. Handhelds like the Hewlett Packard Jornada that use the Pocket PC operating system are able to run Word, Excel, and other Microsoft programs; they also have the ability to record voice and play music.

Many extra programs and hardware add-ons are available for today’s personal organizers allowing them to access the Internet wirelessly, act as portable cell phones, and perform many other individualized functions.