Nikto is an open-source web server scanner designed to identify vulnerabilities and security issues in web applications. It performs comprehensive tests against web servers for various problems, including outdated software, misconfigurations, and potential security threats. The tool is widely used by security professionals and system administrators to enhance the security of their web applications. Nikto can scan for over 6,700 potentially dangerous files and programs, making it a valuable resource for identifying weaknesses before they can be exploited by attackers.