Secondary succession is the process by which ecosystems recover after a disturbance that does not completely destroy the existing soil and organisms. This can occur after events like wildfires, floods, or human activities such as farming. The soil remains intact, allowing for quicker regrowth compared to primary succession, where soil must be created from bare rock. During secondary succession, pioneer species, such as grasses and weeds, are often the first to colonize the area. These plants improve the soil quality, making it suitable for more complex species like shrubs and trees to establish themselves over time. This gradual process leads to a more diverse and stable ecosystem.