This document provides an overview of wearable technologies. It discusses why wearables are useful as they allow people to access information and enhance their experiences anywhere. The history of wearables is reviewed from early inventions like eyeglasses and pocket watches to modern devices. User experience is examined, including principles of functionality and how gadgets can track activities and health metrics. The document also looks at wearable hardware, markets and industries, investment trends, and challenges in the field.