How Does Yelp Create URLs?

[RickyShockley]

Hi all,

How does Yelp (or other sites) go about creating URLs for just about every service and city possible ending with the search? in the URL like this https://www.yelp.com/search?cflt=chiropractors&find_loc=West+Palm+Beach%2C+FL.

They clearly aren't creating all of these pages, so how do you go about setting a meta title/optimization formula that allows these pages to exist AND to be crawled by search engines and indexed?