Answer:
I can be written, I can be spoken, I can be exposed, I can be broken.
You heard me before, yet you hear me again, then I die. Until you call me again.
The person who makes it has no need for it. The person who purchases it does not use it. The person who does use it does not know he or she is. What is it?
A great mysterious place that the bold have been known to journey into.
What does everyone know how to open but not how to close?
What is so fragile that saying its name breaks it?
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?