This section provides history and background on Wearable computing. It includes a range of topics including the human–computer interaction paradigm, the spatial scope of computing, ubiquitous computing, and so on. Wearable devices represent a unique device form factor, and Wearable applications somewhat require a distinct interaction paradigm. Developing applications for Wearable entails some fundamental differences in the interaction and design compared to other platforms such as phone, Web, and desktop. Wearables typically coexist in an ecosystem of cloud-based computing and a multitude of devices that a given user may interact with.