: A "combination list" containing pairs of usernames (or emails) and passwords. These are typically compiled from various past data breaches.

: Likely a specific "brand" or "tag" used by the person who compiled or released the list to distinguish their work.

The phrase is composed of common shorthand used in cybercrime communities to describe the quality and nature of a data set: : Indicates the file contains 2.5 million entries.

These lists are primarily used for . Attackers use automated software to try these 2.5 million username-password pairs on various popular websites. Because many people reuse the same password across multiple platforms, a single leaked credential from one old breach can grant access to a user's more sensitive accounts today. Safety Recommendations

How Attackers Use Password Combolists in Brute-Force Campaigns