Quechua (endonym: Runa Simi) is a Native South American language family and dialect cluster spoken primarily in the Andes of South America, derived from a common ancestral language. It is the most widely spoken language family of the indigenous peoples of the Americas, with a total of probably some 8 to 10 million speakers. At the time of the conquest, the Incans referred to their language as runasimi, only later to be called quechua by conquistadors. Many contemporary Andean Quechua speakers still call it runasimi (or regional variants thereof), literally "people speech", although "runa" here has the more specific sense of "indigenous Andean" people.

To compare with the historically known language families such as Romance, Germanic, Slavic or Arabic entails considering the linguistic process that explains other cases. Several studies (Alfredo Torero or Rodolfo Cerrón Palomino) show that the oldest form of Quechua appeared in Cajamarquilla, Lima. Afterwards, the main focus of this language was the famous zone of Pachacamac (Lima). A third period of expansion was Chincha (Ica). At this time, the Incas found out that the Quechua was very widespread and decided that this was a tool to achieve the unification of the Empire; thus, the language began to spread across the Andes more enthusiastically.

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Quechuas (also Runakuna, Kichwas, and Ingas) is the collective term for several indigenous ethnic groups in South America who speak a Quechua language (Southern Quechua mainly), belonging to several ethnic groups in South America, especially in Peru, Ecuador, Bolivia, Chile, Colombia and Argentina.

The Quechuas of Ecuador call themselves as well as their language Kichwa–Kichwas or Quichuas. In Colombia, the Kichwa-speaking group calls themselves the Ingas. Other Quechua speakers call themselves Runakuna ("People"' in Junín and parts of Ancash, Peru: Nunakuna; singular: Runa or Nuna).

Some historic Quechua peoples include:

The speakers of Quechua, who total some 9-14 million people in Peru, Bolivia, Ecuador, Chile, Colombia and Argentina, have so far only slightly developed a common sense of identity. The various Quechua dialects are in some cases so different that no mutual understanding is possible. Quechua was not only spoken by the Incas, but in some cases also by long-term enemies of the Inca Empire. These include the Huanca (Wanka is a Quechua dialect spoken today in the Huancayo area) and the Chanka (the Chanca dialect of Ayaqcucho) of Peru, and the Kañari (Cañar) in Ecuador. Quechua was spoken by some of these peoples, for example, the Wanka, before the Incas of Cusco, while other peoples, especially in Bolivia but also in Ecuador, adopted Quechua only in Inca times or afterward.