Have Hackers got your Email address/passwords/Credit Card Details?
A "Breach" is an incident where a site's data has been illegally accessed by hackers and then released publicly.
That would include your email addresses, passwords, credit cards, etc.
You can check for this on the following link:-
haveibeenpwned.com/
You just type in your email addresses (nothing else) and it will respond saying if that email address has been compromised.
I've found that some of mine are OK...but some are NOT.
The fix is to usually to get busy changing key passwords ASAP.