: If you haven't changed your passwords in years, do so now, especially for "high-value" accounts like email and banking.
: Claims that the credentials have been "checked" or "tested" against specific services (like Netflix, Amazon, or banking portals) and are currently active.
: A simple, unformatted text file, which is the standard format for sharing large databases of stolen info because it is easy to import into automated hacking tools. How These Lists Are Created