This feature accomplishes two things; enforcing strong passwords for new users by enhancing WordPress default password strength check and removing the possibility for weak, and medium passwords. Secondly, for all users you’re able to force frequent password changes to make sure strong passwords are universal.
If you choose to enforce frequent password changes you can choose the user rules for which this applies. Strong passwords will apply to everyone. The user roles selected will get an email explaining their password will expire in 7 days (based on the dropdown time interval)., after 7 days they will be notified their account is locked, and will need to reset their password before logging in again.
During this reset, they will need to choose a password according to the new enhanced password strength check.