Necessity is that which is indispensably necessary.
Need indicates some temporary want.
1. We cannot conquor fate and necessity yet we can yield to them in such a manner as to be greater than if we could.
2. Food and shelter are necessities of life.
1. I am in need of a good servant.
2. She satisfied his need for affection.
3. God has no need of men to accomplish his work.
4. This page needs to be checked again.
5. Do you need any help ?