An ecosystem is a system formed through the interaction between living organisms with each other and the environment, both physical and chemical in which they live through energy transfer. It includes all of the living things (plants, animals, and organisms) in a given area, interacting with each other, and also with their non-living environments (weather, earth, sun, soil, climate, atmosphere) . Ecosystems are the foundations of the Biosphere and they determine the health of the entire earth system. In an ecosystem, each organism has its own niche or role to play.

Some key points about ecosystems are:

• Ecosystems can be terrestrial or aquatic.
• An ecosystem usually contains many different kinds of life, including nonliving materials such as water, rocks, soil, and sand.
• The main source of energy in almost all ecosystems is the Sun’s energy. As energy moves through the ecosystem, much of it is lost at each feeding level as heat.
• Water, carbon, nitrogen, and other elements constantly circulate through an ecosystem.

In summary, an ecosystem is a complex system of living and non-living things that interact with each other and their environment. It is an important concept in understanding the natural world and the relationships between different organisms.