Religious Taoism (or Religious Daoism) is a system of belief that first showed up in writing in China about 2000 years ago. People do not always write about their religions at first, so this religion may be much older. In it, people do things somewhat like what people do in Shamanism. They also have gods that take over a person to be able to talk to humans and answer their questions. The total number of books in this religion is huge. It is bigger than the Encyclopedia Britannica. Among these books are Lao Zi's Dao De Jing (also spelled Tao Te Jing), the Zhuang Zi (also spelled Chuang Tzu), and many other books by the teachers of Philosophical Daoism (also written "Philosophical Taoism").
People who follow this religion believe that doing something with words, thoughts, symbolic actions, etc. can make things in the real world change. That idea is hard to understand. Here is an example: There is an old story that says China was once covered by a flood. The world was saved from the flood by 禹 Yǔ, who had only one leg that worked. Yǔ went to different parts of China in a special order, and he dug ditches to let the flood water go into the ocean. When something very bad happens in the world, a Daoist priest can go to the Daoist temple and act out what Yǔ did, and just doing that will make the world get fixed.
Daoist priests do many other things. For instance, they can use fire and noise to scare demons away. They can do things to cure sickness. They can perform funerals and help keep the new ghosts safe from harm.