Ecological succession is the steady and gradual change in a species of a GIVEN area with respect to the changing environment. It is a predictable change and is an inevitable process of nature as all the biotic components have to keep up with the changes in our environment.The ultimate aim of this process is to reach equilibrium in the ecosystem. The community that achieves this aim is called a climax community. In an attempt to reach this equilibrium, some species increase in number while some other decrease.In an area, the sequence of communities that undergo changes is called sere. Thus, each community that changes is called a seral stage or seral community.All the communities that we OBSERVE today around us have UNDERGONE succession over a period of time since their existence. Thus, we can say that evolution is a process that has taken place simultaneously along with that of ecological succession. ALSO, the initiation of life on earth can be considered to be a result of this succession process.If we consider an area where life starts from SCRATCH by the process of succession, it is known as primary succession. However, if life starts at a place after the area has lost all the life forms existing there, the process is called secondary succession.It is obvious that primary succession is a rather slow process as life has to start from nothing whereas secondary succession is faster because it starts at a place which had already supported life before. Moreover, the first species that comes into existence during primary succession is known as pioneer species.