The philosophical ideas known in the west as Daoism emerged in China probably between sixth and third century BC, likely overlapping the time of Confucius. The oldest Daoist text, Laozi (Daodejing), begins as follows: The way that can be spoken of Is not the constant way; The name that can be named Is not the constant name. The nameless was the beginning of heaven and earth; The named was the mother of the myriad creatures.

The above translation is from "Lao Tzu: Tao Te Ching", by D. C. Lau, Penguin Classics.
This book at Amazon.com

Both Confucians and Daoists speak of the Dao or Way as a key concept. However, They differ drastically in its interpretation:

"... In contrast to the Confucians who used this word to refer to the ethically correct way for humankind, the way of the sages and the true kings, the Daoists used it to refer to the way of nature, a way beyond the full comprehension of human beings but a way with which they must seek to accord. Confucianism, with its focus on human affairs, is properly labeled a humanistic philosophy. In Daoism human society is seen as only a small part of the total reality, and to gain freedom and power people must come to see their continuity with the natural world."

Quoted from "The Cambridge Illustrated History of China", by Patricia Buckley Ebrey,
Cambridge University Press.  This book at Amazon.com