The Turkic languages constitute a language family of at least thirty-five languages, spoken by Turkic peoples across a vast area from Eastern Europe and the Mediterranean to Siberia and Western China, and are considered to be part of the proposed Altaic language family.

Turkic languages are spoken as a native language by some 165 to 200 million people; and the total number of Turkic speakers is over 300 million, including speakers of a second language. The Turkic language with the greatest number of speakers is Turkish proper, or Anatolian [and Balkan] Turkish, the speakers of which account for about 40% of all Turkic speakers.

Characteristic features of Turkish, such as vowel harmony, agglutination, and lack of grammatical gender, are universal within the Turkic family. There is also a high degree of mutual intelligibility between the various Oghuz languages, which include Turkish, Azerbaijani, Turkmen, Qashqai, Gagauz, Balkan Gagauz Turkish and Oghuz influenced Crimean Tatar.

The characteristic features of the Turkic languages are vowel harmony, extensive agglutination by means of suffixes and other affixes, and lack of noun classes or grammatical gender. Subject–object–verb word order is universal within the family. All of these distinguishing characteristics are shared with the Mongolic, Tungusic, and Korean language families, as well as (with the exception of vowel harmony) with Japonic, which are considered by some linguists to be genetically linked with the Turkic languages in an Altaic language family.

Turkish people, also known as the "Turks" (Turkish: singular: Türk, plural: Türkler), are a nation and ethnic group primarily living in Turkey, and in the former lands of the Ottoman Empire where Turkish minorities have been established in the Balkans, the island of Cyprus, the Levant, Meskhetia, and North Africa. The Turkish minorities are the second largest ethnic groups in Bulgaria and Cyprus. In addition, due to modern migration, a Turkish diaspora has been established, particularly in Western Europe (see Turks in Europe), where large communities have been formed in Austria, Belgium, France, Germany, the Netherlands and the United Kingdom. There are also Turkish communities living in Australia, the former Soviet Union and the United States.

Although Turkic languages may have been spoken as early as 600 BC, the name "Turk" first appeared in Chinese sources and derives from the term "Tujue" (T’u-chue), meaning "strong" or "powerful", which was used in the 6th century C.E. to refer to the Göktürks.

The Iranian languages (also called Iranic languages) form a subfamily of the Indo-Iranian languages which in turn are a subgroup of the Indo-European language family. The speakers of Iranian languages are known as Iranian peoples.

The Iranian languages are considered in three stages of Old (until 400 BCE), Middle (400 BCE – 900 CE), and New (since 900 CE). From the Old Iranian languages the better understood and recorded ones are Old Persian (a language of Achaemenid Iran) and Avestan (the language of Zarathushtra). Middle Iranian languages included Middle Persian (a language of Sassanid Iran) and Parthian (a language of Arsacid Iran). There are many Iranian languages, the largest amongst them are Persian, Pashto, Kurdish, and Balochi.

Today, there are an estimated 150–200 million native speakers of Iranian languages. The Ethnologue lists 87 Iranian languages.Persian has about 65 million native speakers, Pashto about 50 million, Kurdish about 18 million, Balochi about 7 million, and Lurish about 2.3 million.

The Turkic peoples are a collection of ethnic groups that live in northern, central and western Asia, northwestern China and parts of eastern Europe. They speak languages belonging to the Turkic language family. They share, to varying degrees, certain cultural traits and historical backgrounds. The term Turkic represents a broad ethno-linguistic group of people including existing societies such as the Turkish, Azerbaijani, Chuvashes, Kazakhs, Tatars, Kyrgyzs, Turkmens, Uyghurs, Uzbeks, Bashkirs, Qashqai, Gagauzs, Yakuts, Crimean Karaites, Krymchaks, Karakalpaks, Karachays, Nogais and as well as past civilizations such as the Göktürks, Kumans, Kipchaks, Avars, Bulgars, Turgeshes, Khazars, Seljuk Turks, Ottoman Turks, Mamluks, Timurids and possibly Huns and the Xiongnu.

The distribution of people of Turkic cultural background ranges from Siberia, across Central Asia, to Eastern Europe. As of 2011^[update] the largest groups of Turkic people live throughout Central Asia—Kazakhstan, Kyrgyzstan, Turkmenistan, Uzbekistan, and Azerbaijan, in addition to Turkey and Iran. Additionally, Turkic people are found within Crimea, East Turkistan region of western China, northern Iraq, Pakistan, Israel, Russia, Afghanistan, and the Balkans: Moldova, Bulgaria, Romania, and former Yugoslavia. A small number of Turkic people also live in Vilnius, the capital of Lithuania. Small numbers inhabit eastern Poland and the south-eastern part of Finland. There are also considerable populations of Turkic people (originating mostly from Turkey) in Germany, United States, and Australia, largely because of migrations during the 20th century.