Questions relating to mobile computing devices, such as cell phones, tablets, and e-readers. Includes consideration for both small screen size as well as the mobile and "always on" nature of the devices.
Mobile computing is a form of human–computer interaction where a computer is expected to be transported during normal usage. Mobile computing has three aspects: mobile communication, mobile hardware, and mobile software. The first aspect addresses communication issues in ad-hoc and infrastructure networks as well as communication properties, protocols, data formats and concrete technologies. The second aspect focusses on the hardware, i.e. mobile devices or device components. The third aspect deals with the characteristics and requirements of mobile applications.
Reference: Wikipedia article on 'Mobile Computing', retrieved 2011-04-25
Questions tagged mobile should in one way or another reflect a particular aspect unique to mobile devices, as compared to digital screen design in general. Often these are found in size, geographical mobility, different sensors or input methods as well as different ways of consuming and using interfaces from mobile devices.
Also see responsive-design and mobile-web for related issues.