The Tanenbaum-Torvalds debate is a long-running argument between two computer scientists, Andrew Tanenbaum and Linus Torvalds, about which computer operating system (the software that makes your computer work) is the best. Tanenbaum believes that the operating system he designed, called MINIX, is the best while Torvalds thinks his Linux operating system is better. Each has had to defend their operating system against the arguments of the other. In the end, both have been successful - MINIX is still used on a number of computers and Linux is the most popular operating system in the world. So, in the Tanenbaum-Torvalds debate, two people disagree about which operating system is the best, but both are successful in their own ways.