Logging is a crucial aspect of application development, providing a means to document and monitor activities for debugging and enhancing user experience. Ruby offers various logging libraries, each with unique features to facilitate structured and efficient logging. The article highlights the top five Ruby logging libraries: Semantic Logger, Logger Class, Logging, Ougai, and Yell. Semantic Logger is notable for its performance and JSON support, while the Logger Class is a built-in option with a straightforward API. The Logging library, inspired by Java's log4j, offers structured logging and custom logs, whereas Ougai extends the standard Logger with features like JSON formatting and console-friendly output. Lastly, Yell stands out for its adaptability and straightforward configuration, serving as a drop-in replacement for Ruby's built-in logging module. Each library supports various log levels and destinations, offering flexibility for different project needs.