The Uto-Aztecan languages are a family of languages spoken primarily in the western United States and Mexico. This language family includes over 30 languages, with notable members such as Nahuatl, spoken by the Aztecs, and Hopi, spoken by the Hopi people. These languages are divided into two main branches: the northern branch, which includes languages like Shoshone and Comanche, and the southern branch, which includes languages like Tarahumara and Pima. Uto-Aztecan languages share common linguistic features, making them an important area of study for linguists.