Pollution refers to any harmful substances or contaminants that are introduced into the environment, causing negative effects on the air, water, or land. It can be caused by various human activities such as industrial processes, vehicle emissions, improper waste disposal, and deforestation. Pollution poses a threat to the health of ecosystems, plants, animals, and humans, leading to environmental degradation, climate change, and various health issues. Therefore, the term "pollution" accurately describes anything that harms our environment.