A mobile device (also known as cellphone device, handheld device, handheld computer, "Palmtop" or simply handheld) is a pocket-sized computing device, typically having a display screen with touch input or a miniature keyboard. In the case of the personal digital assistant (PDA) the input and output are combined into a touch-screen interface. Smartphones and PDAs are popular amongst those who require the assistance and convenience of a conventional computer, in environments where carrying one would not be practical. Enterprise digital assistants can further extend the available functionality for the business user by offering integrated data capture devices like Bar Code, RFID and Smart Card readers.
There are currently many different operating systems for mobile devices available. A list of the main handheld operating systems is given below.
Handheld devices have become ruggedized for use in Handheld computers used at work have molded over time into a variety of form factors, including SmartPhones on the low end, handheld PDAs, Ultra Mobile PCs, Tablet PCs, and even notebook computers.
Major manufacturers of handheld devices for the work environment include: