A free service, Have I Been Pwned, allows you to check if your online accounts have been compromised in a data breach.
Cybersecurity expert Troy Hunt has added 183 million accounts to the database, making it a valuable resource to check your email address for potential breaches.
Have I Been Pwned is a data breach "search engine" that allows anyone to submit their email address to see if any links to a data breach are publicly known.
Author's summary: Check your online accounts for free.