Debugging is the process of identifying, analyzing, and fixing errors, bugs, and other issues in software applications and websites. Debugging is an essential part of web development and requires specialized tools and techniques, such as debugging software, log files, and error messages. Debugging can involve various activities, such as code review, testing, profiling, and troubleshooting, and can be done by developers, testers, or users. Debugging can be time-consuming and challenging, but can help improve the quality, performance, and reliability of web applications and websites.