A mobile device is a small, portable electronic device, such as a smartphone or tablet, that is designed to be carried around and used on the go. Mobile devices are equipped with a variety of features and capabilities, such as a touch screen interface, a camera, internet connectivity, and a variety of apps and programs that allow users to do things like make phone calls, send text messages, browse the web, and access their email. Mobile devices also have sensors that allow them to detect and respond to movement and changes in their environment, such as a change in location or orientation. Mobile devices are powered by a battery and are designed to be used for long periods of time without being plugged in.