Event Log Manager
An event log manager (ELM) is an application that tracks changes in an organization’s IT infrastructure. These change are reflected in logs, or ’audit trails,’ that must be produced for a compliance audit. Logs must be accurate, verifiable records of events like unsuccessful login attempts, granting or removal of access privileges or email backups.

Event Viewers
Event Viewer allows you to monitor events in your system. It maintains logs about program, security, and system events on your computer. You can use Event Viewer to view and manage the event logs, gather information about hardware and software problems, and monitor Windows security events. The Event Log service starts automatically when you start Windows. All users can view application and system logs.