The word Environment is derived from the French word “Environ” which means all that surrounds us. Environment which is helpful to man’s existence and progress has been divided into physical, . biological and social environments.

1. Physical Environment: It consists of earth, water, mountains and hills, forests, planets, stars, lakes, minerals sources etc., This is called Physical or Natural Environment. The Physical Environment is not created by man: Hence it is called the Natural environment.

2. Biological Environment: This category of environment includes all living things on earth, for the production and growth of all living creatures, environment is complimentary and protecting. 

3. Social Environment: Social Environment is man-made. Social environment is nothing but the collective and cooperative life of human begins. Sociologists feel that “man is a social animal and one cannot live without society”. For the survival of mankind there . must be a cordial relationship with environment.