Log files are files that contain a record of events that have occurred within a specific software application, server, or operating system. They are generated automatically and typically contain timestamps, event levels (INFO, WARN, ERROR), and message details. Log files are the primary resource for troubleshooting issues, monitoring system health, and auditing security events. Sample log files are used to test log analysis tools (like Splunk or ELK Stack) and monitoring agents. Developers use them to verify that parsing rules (Regex) correctly extract fields like timestamps and error codes. They are also used to simulate high-traffic scenarios to test log rotation policies and disk space management utilities.