Combat Log
From WoWWiki
A log of combat actions and results, but may also show results profession activities of nearby characters.
By default, accessible via a Combat Log tab on the General chat window.
Combat Logs may be written to a file using the /combatlog command. The resulting file may be found at Logs\WoWCombatLog.txt. Logs may then be analyzed by a tool such as the popular Wow Web Stats, which analyzes combat logs to generate raid statistics.
In patch 2.4 the combat log was significantly updated, to show more information in a clearer way. Details on this format may be found in the documentation for COMBAT_LOG_EVENT.
