HaveIBeenPwned

Check whether you've been compromised in a data breach, so you can discover whether your passwords or other sensitive data (such as Social Security Numbers, credit card numbers, ID's, etc) has been leaked online somewhere due to a site being breached. You can also subscribe to be notified when your data is found online. The 2cd link checks for pwned passwords while the 1st searches for any data breaches associated with an email.