: Data compiled from multiple historic breaches (like LinkedIn, MySpace, or Adobe) alongside newer, smaller leaks occurring late in 2020 or early 2021.
: Use tools like Have I Been Pwned to verify if your email address has appeared in known data breaches.
: Turn on Multi-Factor Authentication wherever possible to add a layer of security beyond just a password.
: Massive lists of usernames (or emails) and their associated plaintext or hashed passwords, often formatted for use in automated credential-stuffing attacks.