What is a WordPress static site generator?

[Adnorips]

Hey guys,
would like to consult with you on Wordpress static site generator.
I've heard it from one of my clients. I've also done a search and found Flatsite.com - it offers this solution.
Have you tried it? Could you share your experience with me?

Thanks.

[Mirandas]

I manage and update websites with a single click. FLATsite.com Stack lets me create multiple WordPress instances and store files and databases locally, all controlled under one roof. Thanks.