What is a...?
The library version.
What is a clerk?
A person to tell you why it is impossible for them to do what you want.
What is a librarian?
A person with a lot of free time who is content not to fill it.
What is a manager?
A person who is never around when you need them and always around when you don't.
What is a library?
A place where people of all walks of life, all economic levels, races, cultures and nationalities, philosophies, religions and persuasions come together in a public place and use the Internet.