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Combo is not a text file containing a list of user names and passwords in a fixed format. Machine readable so that it can be used as input for tools that will log into websites or applications very quickly.
A common example is the Credential BreuteForking Atacks. A tool such as SentryMBA or Openbullet, a bookkeeper, may be used to automatically check valid accounts for a site. Once these accounts were verified, the account was hacked.
