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The Tao Te Ching (traditional Chinese: 道德經; simplified Chinese: 道德经) or Laozi is a Chinese classic text and foundational work of Taoism traditionally credited to the sage Laozi, though the text's authorship, date of composition and date of compilation are debated. The oldest excavated portion dates to the late 4th century BC.

The Tao Te Ching is central to both philosophical and religious Taoism, and has been highly influential to Chinese philosophy and religious practice in general. It is generally taken as preceding the Zhuangzi, the other core Taoist text, as claimed within the text itself. Terminology originating within the text has been reinterpreted and elaborated upon by Legalist thinkers, Confucianists, and particularly Chinese Buddhists, which had been introduced to China significantly after the initial solidification of Taoist thought. The text is well known in the West, and is one of the most translated texts in world literature.