it's a noob question, isn't?

This is a 'tagged template literal' (https://tc39.github.io/ecma262/#sec-tagged-templates)

ok thx never see before

Well, I actually learned something by linking you to the docs, because I did not know how they actually worked, e.g. that you can use any tag and write a function for it. So, thanks for asking! I have just blindly followed the examples using graphql` until now 🙂

cool