What is the difference between log levels (e.g., error, warn, info, debug) in a logger?

Log levels represent the severity or importance of a log message. `Error` indicates a critical problem that requires immediate attention. `Warn` indicates a potential problem. `Info` provides general information about the application's operation. `Debug` provides detailed information useful for debugging, typically not shown in production environments. The log level determines which messages are actually logged based on the configured level.