The hardware beneath the screen of a PDA is just as important as the aesthetics of a PDA. These devices display a graphical user interface on a screen. Several underlying, physical components are necessary in order for the device to function properly: a processor, random access memory (RAM), storage space, an input device, and a power source. A PDA is basically a small computer. As such, it performs the four functions of a computing system: input, process, output, and storage. Once data is generated, it is stored either in a hard drive or a small flash storage drive. Many PDAs provide for removable storage devices, which can boost productive efficiency.
Most PDAs have either a physical, miniature keyboard attached to the device, or they use inputting software which generally displays a keyboard on screen. Newer PDA devices include a WiFi by which a user can connect to a wireless network either to upload or download information, most likely from the web. Lastly, a battery is needed to power a PDA. In general, rechargeable Lithium-Ion batteries are used. When all these components are assembled properly, a PDA can be a powerful connectivity device.
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