The Audit Log keeps track of changes to your website.
A standardized, title-like description of site activity.
The page or function on which the action was taken. This is a link so you can click to where the action happened if you wish.
A more specific description of what was done.
Who dunnit! This references the login used for the action taken. If someone used your login to make edits, it will reference you as the "By".
When the action happened.