The so-called "Tao" in "Laozi" is actually the Hunyuan Wuji before Yin and Yang are judged. The origin of the universe, the origin of heaven and earth, the foundation of all things, and the cardinal mechanism of creation. It is formless, colorless and odorless, omnipresent, omnipresent, filling the universe, pervading the ten directions, neither increasing nor decreasing, and exists forever. It is intangible and nameless, but it does exist. Laozi wants people to recognize it, study it, master it, and use it. Hence the name "Tao".