This tag should be used for questions related to stories set in the "Man-Kzin Wars" shared universe, originated by Larry Niven and contributed to by several other authors.
The "Man-Kzin Wars" series refers to a collection of short stories and/or collections of those stories, all of which feature plots taking place in a fictional universe originally created by author Larry Niven. In this universe, mankind has encountered (and gone to war with) a feline alien race known as the Kzinti.
While the original story in this universe was published in 1966, it did not become a shared universe until 1988. Since then, several authors (including well-known names such as Poul Anderson, Jerry Pournelle, Greg Bear, and Gregory Benford) have published over 50 stories set in that universe.