Type

Windows NT™ defines five types of event logging. Each event must be of a single type, because types cannot be combined.

Event type	Description
Information	Information events are used to note infrequent but significant successful operations. For example, when Microsoft SQL Server successfully loads, it may be appropriate to log a "SQL Server has started" information event. Note that while this is appropriate for major server services, it is generally inappropriate for a desktop application (Microsoft Excel, for example) to log an event each time it is started. Information events should not be used as a trace facility.
Warning	Warning events are used to indicate problems that are not significant, but that may foretell of future errors or other problems. Resource consumption is a good candidate for a Warning event. For example, a warning could be logged if disk space is low. Errors that are recovered without loss of function or data can be classified as warnings.
Error	Error events are used to indicate significant problems that have occurred and that the user should know about. Errors usually indicate a loss of functionality or data. For example, if a service cannot be loaded as the system boots, an Error event can be logged.
Success Audit	Success Audit events are security events that occur when an audited access attempt is successful. For example, a successful logon attempt is a Success Audit event.
Failure Audit	Failure Audit events are security events that occur when an audited access attempt fails. For example, a failed attempt to open a file is a Failure Audit event.

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