A Debian derivative is a distribution that is based on the work done in Debian but has its own identity, goals and audience and is created by an entity that is independent from Debian. Derivatives modify Debian to achieve the goals they set for themselves.
What is Debian Linux based on?
Debian is one of the oldest operating systems based on the Linux kernel. The project is coordinated over the Internet by a team of volunteers guided by the Debian Project Leader and three foundational documents: the Debian Social Contract, the Debian Constitution, and the Debian Free Software Guidelines.
Is Debian based on Ubuntu?
Ubuntu develops and maintains a cross-platform, open-source operating system based on Debian, with a focus on release quality, enterprise security updates and leadership in key platform capabilities for integration, security and usability.