A digital mobile device (that is, easily portable, portable) is any small device that usually contains a display and a miniature keyboard (a touch screen with a virtual keyboard was invented later). Initially, these were mainly handheld devices, but the variety of such devices is constantly increasing. Devices are becoming more flexible and can perform various functions, such as recording and playing multimedia, connecting to video chats, connecting to the Internet, and payment functions.
Mobile devices have an operating system (OS) and can run various applications, known as mobile applications. Most of them are also equipped with their various types (Wi-Fi, Bluetooth, GPS), which allow you to connect to computer networks or other similar devices or, for example, headphones. They are often equipped with one or two miniature digital cameras, and their power is provided by a lithium battery.
An example of an early mobile device is a personal digital assistant (PDA), also known as Pocket PC. In the first decade after 2000, smartphones, tablets and e-readers were added to mobile devices. Touch screens are increasingly being used as the user interface, and functionality is expanding to cover desktop computers and laptops. New features have been added, such as barcode readers, RFID and smart card readers. By 2010, accelerometers, compasses, magnetometers and gyroscopes were added, allowing you to react to movement and determine orientation. Biometric identification methods, such as face or fingerprint recognition, are becoming more and more popular.
Manufacturers of mobile devices are HTC, LG, Motorola, Samsung, Apple and many others. In 2013, 24% of connected mobile devices (mainly tablets and smartphones) in the world were in China.