Here's a breakdown:

* Succession: The process of change in the species structure of an ecological community over time.

* Seral stage: Each distinct stage in this process, characterized by a different plant community.

For example, in a forest succession:

1. Pioneer stage: The first stage, often dominated by grasses and weeds.

2. Intermediate stage: May see shrubs and small trees developing.

3. Climax stage: The final, stable stage where the dominant species are long-lived trees, creating a mature forest ecosystem.

Each seral stage is characterized by specific environmental conditions and a particular group of plant and animal species that thrive in those conditions.