Afforestation is the process of planting trees, or sowing seeds, in a barren land devoid of any trees to create a forest. The term should not be confused with reforestation, which is the process of specifically planting native trees into a forest that has very few numbers of trees. While reforestation is increasing the number of trees in an existing forest, afforestation is the creation of a ‘new’ forest. Afforestation is highly important to maintain the biodiversity. Trees use water and carbon-dioxide (CO2) to convert it into organic matter (wood) and oxygen. Thus, trees acts as natural air-purifiers and helps revive the environment. An afforested plantation is composed of trees planted to shelter farmland and agricultural crops from the effects of wind, potentially to reduce soil erosion, or serve as a source of fuel wood or income in an arid or semiarid agricultural environment which is commonly called a shelter belt.