The understory is the layer of vegetation in a forest that grows beneath the canopy but above the forest floor. It consists of smaller trees, shrubs, and young plants that thrive in the filtered light that reaches them. This layer plays a crucial role in the ecosystem by providing habitat for various wildlife, including birds, insects, and mammals. In addition to supporting biodiversity, the understory helps with nutrient cycling and soil stability. Plants in this layer often have adaptations to survive in low light, such as larger leaves. The understory is vital for maintaining the overall health of forest ecosystems, including those found in tropical rainforests like the Amazon.