Have I Been Pwned (HIBP) is an online service founded by Australian security expert Troy Hunt in December 2013. It offers a free platform for individuals to check if their personal data, such as email addresses and passwords, has been compromised in data breaches. HIBP has gained popularity for its user-friendly interface and its role as a vital resource in the cybersecurity community.

The service includes a data breach lookup tool, breach notifications, and password checking features. Users can enter their email addresses to see if they have been affected by any of the hundreds of breaches in HIBP's extensive database. Additionally, subscribers can receive alerts for future breaches involving their email addresses. HIBP also provides APIs for integration with other services, enhancing overall internet security.

With records from over 840 breaches and nearly 10 billion compromised records, HIBP processes thousands of requests daily. It serves individual users, security professionals, and organizations, helping them understand and mitigate the risks associated with data breaches.