Lao Tzu is considered the founder of Taoism in China in the 6th century BC. He authored the Tao Te Ching, which outlines Taoist philosophical concepts like wu wei or non-action. Over time, Taoism developed religious elements with a pantheon of deities and practices like alchemy. Major Taoist sects emerged like the Way of the Celestial Masters founded in the 2nd century CE. Taoism today continues through religious organizations, with the White Cloud Temple in Beijing considered an important center.