Explain the term ecosystem?

The ecosystem is defined as a unit of biosphere which has the structural and functional aspects. It consists of the community and physical environment including the interactions between them. It was introduced in the year 1935 by the Tansley.
The ecosystem can be temporary which includes the rain water pond. It can be permanent also. They may be natural which includes the rivers. They are also manmade which includes the aquarium. It can be small which includes the pond or a drop of water. It can be large which includes the ocean. There is a small ecosystem known as the micro ecosystem. The distinct community consisting of number of different species forms an ecosystem.