All the community in the given area which interact among themselves with the physical inviornment and flow of energy leads to early define a trophic structure , biotic diversity material cycle within a system is called Ecosystem
An ecosystem is a large community of living organisms (plants, animals and microbes) in a particular area. The living and physical components are linked together through nutrient cycles and energy flows. Ecosystems are of any size, but usually they are in particular places.
Ecosystem is a self sustaining structural and functunal unit of biosphere. It consist of various food chains and food webs which result in energy flow and makes it self sustaing.