Laozi is a revered figure in Chinese culture, traditionally identified as the author of the Tao Te Ching, a foundational text of Taoism. However, modern scholarship widely views the biographical details surrounding Laozi as later fabrications and the Tao Te Ching as a composite work by multiple authors, with the name 'Laozi' likely serving as an honorific title meaning 'Old Master.' Traditional accounts place him in the 6th century BC, serving as the royal archivist for the Zhou dynasty and encountering Confucius. Some narratives describe him composing the Tao Te Ching before withdrawing into the wilderness. Various traditions associate him with the founding of Taoism, and he is honored by some sects as an immortal hermit or even a divine manifestation.

The Tao Te Ching itself is a significant philosophical and religious work, exploring concepts such as the Tao as the fundamental source of existence, the importance of simplicity, humility, and 'wu wei' (non-action or effortless action) for achieving harmony with the natural order. The text's authorship and precise dating have been subjects of extensive scholarly debate, with manuscript evidence suggesting the text evolved over centuries rather than being the product of a single author at a specific historical moment.

The figure of Laozi is central to Taoism, though modern scholarly consensus suggests his biographical details are likely inventions and the Tao Te Ching is a collaborative text. While traditional accounts identify him as Li Er, born in the 6th century BC state of Chu and serving as the royal archivist for the Zhou court, these narratives are viewed critically by contemporary historians. The name 'Laozi' itself is an honorific title, meaning 'Old Master,' possibly intended to create an archaic authority. The Tao Te Ching, the foundational text attributed to him, is now generally considered to be a compilation of sayings from various writers, with its composition possibly extending into the Warring States period (c. 475–221 BC).

The Tao Te Ching, often referred to as 'Laozi,' is a seminal work exploring the nature of the Tao, understood as the ultimate source and principle of all existence. It advocates for a return to a natural state in harmony with the Tao, emphasizing simplicity, humility, and detachment from conventional desires and societal constructs. A key concept is 'wu wei,' which translates to 'non-action' or 'effortless action,' suggesting a mode of being that flows spontaneously with the natural course of events rather than imposing artificial will. The text critically examines language and societal values, using paradox and analogy to convey its teachings, and is noted for its lack of a central master figure, contributing to its timeless quality.

Early accounts of Laozi, notably from Sima Qian's Records of the Grand Historian, present various biographical narratives, some placing him as a contemporary of Confucius. These stories often describe him as a scholar who worked at the Zhou court, gaining access to ancient texts. One prominent narrative involves Laozi being recognized by a guard at a western pass, who requests he record his wisdom before departing. This led to the composition of the Tao Te Ching. Later interpretations and legends expanded upon these accounts, with some traditions claiming Laozi became an immortal hermit, journeyed to India to teach the Buddha, or was even the Buddha himself. He is also revered as a progenitor of the surname Li and historically as an ancestor of the Tang dynasty.