Kali Linux is a specialized operating system designed for penetration testing and cybersecurity tasks. It is based on Debian and comes pre-installed with numerous tools that help security professionals assess the security of systems and networks. This operating system is widely used by ethical hackers and security researchers to identify vulnerabilities and strengthen defenses. Kali Linux is open-source, allowing users to modify and customize it according to their needs, making it a popular choice in the field of information security.