Lignin is a complex organic polymer found in the cell walls of plants, especially in wood and bark. It provides structural support, helping plants stand tall and resist decay. Lignin is what makes trees sturdy and gives them their strength, allowing them to grow in various environments. In addition to its structural role, lignin plays a crucial part in the carbon cycle. When plants die and decompose, lignin breaks down slowly, releasing carbon back into the soil. This process is essential for maintaining soil health and supporting new plant growth, making lignin an important component of our ecosystem.