Uzbek is a Turkic language

Turkic languages

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...

 and the official language of Uzbekistan

Uzbekistan

Uzbekistan , officially the Republic of Uzbekistan is a doubly landlocked country in Central Asia and one of the six independent Turkic states. It shares borders with Kazakhstan to the west and to the north, Kyrgyzstan and Tajikistan to the east, and Afghanistan and Turkmenistan to the south....

. It has about 25.5 million native speakers, and it is spoken by the Uzbeks

Uzbeks

The Uzbeks are a Turkic ethnic group in Central Asia. They comprise the majority population of Uzbekistan, and large populations can also be found in Afghanistan, Tajikstan, Kyrgyzstan, Turkmenistan, Kazakhstan, Russia, Pakistan, Mongolia and the Xinjiang Uyghur Autonomous Region of China...

 in Uzbekistan

Uzbekistan

Uzbekistan , officially the Republic of Uzbekistan is a doubly landlocked country in Central Asia and one of the six independent Turkic states. It shares borders with Kazakhstan to the west and to the north, Kyrgyzstan and Tajikistan to the east, and Afghanistan and Turkmenistan to the south....

 and elsewhere in Central Asia

Central Asia

Central Asia is a core region of the Asian continent from the Caspian Sea in the west, China in the east, Afghanistan in the south, and Russia in the north...

. Uzbek belongs to the southeastern Turkic or Uyghur family of Turkic languages, and consequently its lexicon

Lexicon

In linguistics, the lexicon of a language is its vocabulary, including its words and expressions. A lexicon is also a synonym of the word thesaurus. More formally, it is a language's inventory of lexemes. Coined in English 1603, the word "lexicon" derives from the Greek "λεξικόν" , neut...

 and grammar

Grammar

In linguistics, grammar is the set of structural rules that govern the composition of clauses, phrases, and words in any given natural language. The term refers also to the study of such rules, and this field includes morphology, syntax, and phonology, often complemented by phonetics, semantics,...

 are most closely linked to the Uyghur language

Uyghur language

Uyghur , formerly known as Eastern Turk, is a Turkic language with 8 to 11 million speakers, spoken primarily by the Uyghur people in the Xinjiang Uyghur Autonomous Region of Western China. Significant communities of Uyghur-speakers are located in Kazakhstan and Uzbekistan, and various other...

, while other influences rose from Persian

Persian language

Persian is an Iranian language within the Indo-Iranian branch of the Indo-European languages. It is primarily spoken in Iran, Afghanistan, Tajikistan and countries which historically came under Persian influence...

, Arabic

Arabic language

Arabic is a name applied to the descendants of the Classical Arabic language of the 6th century AD, used most prominently in the Quran, the Islamic Holy Book...

 and Russian

Russian language

Russian is a Slavic language used primarily in Russia, Belarus, Uzbekistan, Kazakhstan, Tajikistan and Kyrgyzstan. It is an unofficial but widely spoken language in Ukraine, Moldova, Latvia, Turkmenistan and Estonia and, to a lesser extent, the other countries that were once constituent republics...

.
Turkic speakers have probably settled in the Amu-Darya, Syr-Darya and Zeravshan

Zeravshan

Zeravshan River is a river in Central Asia. Its name, "sprayer of gold" in Persian, refers to the presence of gold-bearing sands in the upper reaches of the river. To the ancient Greeks it was known as the Polytimetus...

 river basins since at least AD600-700, gradually ousting or assimilating the speakers of Eastern Iranian languages

Eastern Iranian languages

The Eastern Iranian languages are a subgroup of the Iranian languages emerging in Middle Iranian times .The Avestan language is often classified as early Eastern Iranian. The largest living Eastern Iranian language is Pashto, with some 50 million speakers between the Hindu Kush mountains in...

 who previously inhabited Soghdiana, Bactria

Bactria

Bactria and also appears in the Zend Avesta as Bukhdi. It is the ancient name of a historical region located between south of the Amu Darya and west of the Indus River...

 and Chorasmia.