Ecosystem is a combination of two words ,Ecological & System.It is related to ecology which means the study of the interaction between living and non-living things in a specific area.For survival of an ecosystem ,balance of all factors is necessary. Even if one factor or an element e.g. temperature gets disturbed ,all ecosystem comes under threat.Study of ecosystems is known as ecology.In an ecosystem,every organism has a role to play. There can be several types of ecosystems e.g. fresh water ecosystem like in river,or pond ecosystem,desert ecosystem ,ecosystem in cold regions like Tundra ecosystem or Antarctica ecosystem.