On the DVD

The Kali Linux open source project delivers "more than 300 penetration testing and security auditing programs … that enables IT administrators and security professionals to test the effectiveness of risk mitigation strategies" [1]. The newest Kali Linux [2] is:

• Non-root: The default user account is now the standard, unprivileged user kali, not the superuser account, root, as delivered in earlier versions.
• Live network install image.
• Default Xfce desktop.
• Rolling distribution, so you get updates as soon as they are available.
• Python 2 tools removed because Python 2 reached end of life January 2020.

Although possible, the developers do not recommend you use Kali Linux as your primary OS, because they do not test that use case.