The ecosystem is a specific biotic and abiotic identity landscape. Ecosystem can be terrestrial and aquatic. Through these ecosystems, the key conditions of life on earth are visible. The biotic and abiotic components of each ecosystem have a deep mutual inter – relationship. In the terrestrial ecosystems, forest, grassland, desert, mountain, island, etc., and in aquatic ecosystems, ponds, lakes, swamps, rivers, delta and oceans are included. Some basic elements are present in each ecosystem. For example, natural structure of ecosystem, its system of functioning, use, degradation of ecosystem and rejuvenation and protection are given prominence.