Auditing encompasses a wide variety of activities as follows: Logging: It is the activity of recording information to a log file or database about events or occurrences. Log Analysis: It is a systematic form of monitoring where the logged information is analyzed in detail. It is done to find out the trends and patterns as well as abnormal, unauthorized, illegal, and policy-violating activities. Intrusion Detection: It is a process to detect unwanted system access by monitoring both recorded information and real time events. Alarm Triggers: These are the notifications that are sent to an administrator whenever a specific event occurs. Monitoring: It is the activity of manually or programmatically reviewing logged information.