Forests serve different purposes. It provides Oxygen, food , clothes, timber, shelter etc. Forests are a very important natural resource provided to us. Forests serve as a watershed. Forests serve as a home (habitat) to millions of animals. Forests are of immense economic importance to us. It provide economic benefits. Climate control and atmosphere purification is key for human existence. 
Forest is the place where large number of trees and plants grow.Forest-our lifeline , it means that forest is helping is in many ways.It provides us fruits, flowers, medicines, wood (timber), more than this it provides shelter to large number of living beings. Forests are the of biodiversity. Forests has many trees and plants , which helps us to lead life by providing oxygen to environment. Hope this helps you