A mobile device' (also known as converged device, handheld device, handheld computer, "Palmtop" or simply handheld) is a pocket-sized computing device, typically comprising a small visual display screen for user output and a miniature keyboard or touch screen for user input. 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.
Handheld devices have become ruggedized for use in mobile field management situations to record information in the field. They are now used to achieve a variety of tasks for increasing efficiency that include digitizing notes, send and receive invoices, asset management, capture signatures, manage parts and scan barcodes, etc[1]. 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.
