Reforestation is the process of planting trees in areas that have been deforested or degraded in order to restore the ecosystem and increase the forest cover. This can be done through natural regeneration, where trees are allowed to grow back on their own, or through active planting of tree seedlings. Reforestation helps to combat climate change by sequestering carbon dioxide, provides habitat for wildlife, improves soil health, and helps to prevent erosion and flooding. It is an important tool in promoting sustainable land management and conserving biodiversity.