Environment means what surrounds us. It may be living or non-living things. It includes physical, chemical and other natural forces. Living things live in their environment. They constantly interact with it and adapt themselves to conditions in their environment. In the environment there are different interactions between animals, plants, soil, water, and other living and non-living things. The word environment is used to talk about many things. For example, trees, rivers, and oceans are a part of the environment. People in different fields of knowledge use the word environment differently. Electromagnetic environment is radio waves and other electromagnetic radiation and magnetic fields. The environment of a galaxy may mean the interstellar medium, or it may mean other nearby galaxies.

In psychology and medicine, a person's environment is the people, physical things and places that the person lives with. The environment affects the growth and development of the person. It may affect the person's body and mind.

The conditions of living organisms in an environment are affected by the weather and climate changes in the environment. They are also greatly affected by other living things.