Machairodontinae is an extinct carnivoran mammal subfamily of Felidae (true cats) endemic to Asia, Africa, North America, South America, and Europe from the Miocene to Pleistocene living from c. 23 Ma until c. 11,000 years ago.
It contains some of the extinct predators commonly known as "saber-toothed cats", including the famed genus Smilodon as well as other cats with only minor increases in the size and length of their maxillary canines. Sometimes other carnivorous mammals with elongated teeth are also called saber-toothed cats, although they do not belong to the felids. Besides the machairodonts, saber-toothed predators arose in Nimravidae, Barbourofelidae, Creodonta (Machaeroidinae) and even in a group of sparassodont metatherians (Thylacosmilidae).
Read more about Machairodontinae: Derived Anatomy and Diet, Purpose of The Canines, Popular Culture