This document outlines key concepts about forestry. It defines a forest as a group of trees growing together over a large land area, and forestry as the science of creating, managing, and conserving forests. It lists four factors that affect forest distribution: soil, human activities, precipitation, and temperature. It describes seven problems facing forestry in Kenya, including poor management, pest and disease attacks, encroachment, wildfires, destruction by wild animals, overexploitation of resources, and extinction of indigenous tree species. The importance of forests and their products is also summarized.