Handheld computer is an electronic computing device held in one hand while operated by the other. Today, handheld computers are often called mobile devices, a term that refers to portable electronics that can wirelessly transmit data. Mobile devices are widely used by consumers for everyday purposes. Handheld mobile devices include smartphones and small tablet computers, as well as a few more specialized devices, such as the e-readers designed to display e-books (electronic books). Many mobile devices have advanced capabilities, but most are not as powerful as desktop or laptop computers.
Businesses in some industries use specialized handheld computers. For example, package delivery services use handhelds with built-in scanners to track packages by reading their coded labels. Delivery businesses can also use handheld computers to collect signatures for deliveries received.
Most handheld computers are controlled by a touch screen. Pressing or tapping the screen in certain places sends corresponding information to the computer. In pen-based computers, the touch screen works with a penlike tool called a stylus. Generally, the user can write on the screen with the stylus. Handwriting recognition software converts the handwritten words to digital text. Most devices for consumers have touch screens that receive input from the fingertips. When inputting text is required, the device displays an onscreen keyboard layout that the user can type on.
During the 1990’s, handheld computers called personal digital assistants (PDA’s) were a popular way to store addresses, keep daily calendars, send and receive emails, listen to music, read e-books, create spreadsheets, and use the internet. Some PDA’s included the functions of a cell phone or a digital camera. The use of PDA’s declined as smartphones became widely available.
