How does flask.g work?

Question

Flask

Hello everyone Plz tell me the features of
flask.g, namely where the "id records" are
stored I fasten the authorization on the site, using current_user I add the current user to g:
g.user = current_user
when registering). So I do not quite understand where flask stores this number, it seems like flask.g stores data only during the validity period of the request.
Explain plz who knows how
thank you