: They are rarely from a single breach. Instead, they are a Compilation of Many Breaches (COMB) , pulling data from various historical leaks, phishing campaigns, or infostealer logs .

In the world of cybersecurity, a refers to a text file containing 99,000 sets of usernames (or emails) and passwords that are marketed as "valid" or verified.

: Typically structured as email:password or username:password .