People are searching for  Fidget Spinner a lot but I don’t know anything about it.  So I have some questions about Fidget Spinner.  my questions are below. Please give me the correct answers.

1. What is Fidget Spinner?
2. How to use Fidget Spinner?
3. Where to buy Fidget Spinner?
4. How to choose best Fidget Spinner?

Thanks a lot.