This document provides an introduction to training and development. It discusses key components of learning including learning, human capital, knowledge, training, development, formal and informal training. It also discusses explicit and tacit knowledge as well as knowledge management. The document outlines the importance of training and discusses factors that impact learning such as economic cycles, globalization, intangible assets, business strategy, diversity, generations, talent management, technology, and high-performance work systems. Finally, it discusses common training roles and in-demand skills.