Have I been pwned?
Unless you've been living off grid and eating mud then the chances are you have online accounts at many websites.
These sites are constantly under attack from hacker and on occasion even the biggest ones fail and give up your data to hackers. It could anythning from just your email account to your fill life story. The have I been pwned website allows you to check your email address or domain agains a vast list of compromised user account details.
"Have I been pwned?" Was created by Troy Hunt as a free resource for anyone to quickly assess if they may have been put at risk due to an online account of theirs having been compromised or "pwned" in a data breach. He wanted to keep it dead simple to use and entirely free so that it could be of maximum benefit to the community. But it's worth while dropping him a donation if you find the service useful.
You'll find the website at https://haveibeenpwned.com.