It use for many things such as
1. to make medicine
2. to make animal and birds live
3. conserve the soil 
4. prevent flood
5. use for make furniture
Forests are very important for our survival.The reasons for this are:
We get wood or timber from the trees in the forest which in turn is used to make furnitures etc.
We get wood pulp from the trees which is used to make newsprint and matchsticks.
We get oxygen from green leaved plants which is used by us for breathing.
We get fruits from the trees.
We get medicines from some trees like quinine from cinchona used to cure malaria.
we get shed from them.
We get other products too like resin , gum etc.
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