The food chains are the living components of the biosphere. These are the vehicles of transfer of energy from one level to another. Through the food chains, transfer of materials and nutrients also takes place.

So a food chain is a picture of organisms in an ecological community that are linked to each other through the transfer of energy and nutrients, beginning with an autotrophic organism such as a plant and continuing with each organism being consumed by one higher in the chain. A food chain also shows how the organisms are related with each other by the food they eat.

We all depend upon food to survive. Energy is necessary for the biotic world to grow and sustain. A food chain describes the method in which a particular organism collects its food. It is an arrangement of who eats whom in a biological community or an ecosystem to obtain food. A food chain is a way of depicting the flow of energy from one organism to the next and to the next and so on. Everyone needs the energy transmitted through a food chain in order to survive.