Logback is a popular logging framework for Java applications, designed to be fast and efficient. It serves as a successor to the Log4j framework and is part of the SLF4J (Simple Logging Facade for Java) ecosystem. Logback provides a simple configuration format and supports various logging levels, making it easy for developers to manage application logs. One of the key features of Logback is its ability to automatically compress and archive log files, which helps in managing disk space. It also supports advanced filtering and can be easily integrated with other frameworks like Spring for enhanced logging capabilities. Overall, Logback is a powerful tool for effective logging in Java applications.