This document provides an introduction to pervasive computing. Pervasive computing aims to make computing available anywhere through embedding microprocessors in everyday objects. It allows computing power and connectivity to be spread throughout physical environments. Some key aspects covered include ubiquitous access across devices and networks, context-aware computing that tailors services based on environmental factors, and emerging applications in areas like smart clothing, interactive posters, and pill cameras. Ongoing research continues to explore how pervasive technologies can create smarter and more connected systems and environments.