Answer:
The buyer doesn’t want it, the producer doesn’t need it and the user doesn’t know their using it.
It is a popular afterlife destination where you want to send people when you're mad at them.
It has the biggest wall and is also used when drinking tea.
What has thousands of ribs and two backbones?
If it is absolute, it will corrupt absolutely.
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?