The type of an event log entry provides additional information for the entry. Applications set the entry type when they write the entry to the event log.
Each event must be of a single type; the event types cannot be combined for an entry. The Event Viewer uses this type to determine which icon to display in the list view of the log.
An error event. This indicates a significant problem the user should know about; usually a loss of functionality or data.
A failure audit event. This indicates a security event that occurs when an audited access attempt fails; for example, a failed attempt to open a file.
An information event. This indicates a significant, successful operation.
A success audit event. This indicates a security event that occurs when an audited access attempt is successful; for example, logging on successfully.
A warning event. This indicates a problem that is not immediately significant, but that may signify conditions that could cause future problems.