´╗┐There are 3 types of succession. Ecological succession, Primary succession, and Secondary succession.

In Ecological Succession communities may change drastically as a result of a disturbance.
A varitey of species may colonize the disturbed area.
These species may be replaced as yet another species move into the area later on.
The process of community change is ecological succession.

Primary succession is when a community arises that has no soil.
This process takes houndreds or even thousands of years.
It starts with: Autotrophic microorganisms, then lichens and mosses.
Soil developes over a lenghthy peroid of time.
Then grasses, shrubs and trees appear.

Secondary Succession occurs when a disturbance damages an existing community, but leaves the soil intact.