Question

How is neem tree useful?

Answer 1

Neem tree is a source of neem leaves, its useful as many diseas are cured by neam leaves (:

Answer 2

Though the neem leaves taste bitter they find their use in the medicinal products. They have a great medicinal property.
They are also helpful in curing chicken pox, axemia, fungal infections etc.
Its twig are used as toothbrushes in rural areas.
Its leaves are mashes & eaten to clear internal toxins.