There are very many applications in PDAs. The user can actually decide what kind of applications are to be incorporated. PDAs have applications that are useful in medicine. It assists in diagnosis of disease, treatment and the selection of drugs. It can record symptoms as well as present information on treatments. PDAs are applied in the educational field, particularly by students. The relevant tasks that it can execute are digital note taking and its modification, the spell-check, dictionaries, e-books storage and use, digital planning lessons, word processing and many others. It finds application in the field of sports in the calculation of speed, distance and time; pre-flight planning and assistance to the glider pilots in navigation linked to the use of GPS, and for road rallyist with GPS assisted navigation.

Digital Equipment Corporation Western Research Laboratory (WRL) developed iPaq originally. It runs on an Intel Pentium III processor or an Intel Celeron processor with a processing speed of 500 MHz to 1 GHz. It has a memory ranging from 128 MB to as much as 512 MB. The memory can be upgraded also. Some of the popular handheld PDA gadgets are Palm TX Handheld, HP iPAQ 111 Classic Handheld, Nokia N810 Portable Internet Tablet, Palm Tungsten E2 Handheld, Asus A626 3.5-inch PDA Windows Mobile 6.0, HP iPAQ 210 Enterprise Handheld, Sony Ericsson C905i Unlocked Cell Phone and Nokia 02700T6 N810 WiMAX Edition Portable Internet Tablet.

Our life is no longer the same. Mobile technologies have drastically changed the way we work and live. For instance, mobile shopping and mobile banking save lot of our time, energy and worry besides its convenience and ease. We now make use of PDAs for such diverse use as getting to know about the weather, knowing the sports score and getting the stock quotes. It is fast becoming a device without which we will not be able to function and carry out our day to day activities.