Answer:
Everyone in the world needs me. They generously give me but never take me. What am I?
What language does a billboard speak?
I go in dry and come out wet. The longer I stay in the stronger my surroundings get.
I belong to you but others use me more often than you do
I move without wings, between silken strings. I leave as you find my substance behind. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.