This document provides an introduction and overview of wearable computers. It discusses the history of wearable computers beginning in the 1970s when Steve Mann invented the first wearable computer. It describes the key components of wearable computers including displays, keyboards, hard drives, batteries, and voltage regulators. The document outlines several applications of wearable computers such as augmented reality, health monitoring, smart eyewear, and military uses. Both advantages like portability and disadvantages like expense and potential health issues are noted.