Lao Tzu's Principle, also known as the Tao, is a Chinese philosophical concept that emphasizes the importance of living in harmony with nature and the universe. It is often represented by the symbol of the yin and yang, which represent the balance between opposites. The Tao is often associated with Lao Tzu, an ancient Chinese philosopher who wrote the Tao Te Ching, a book of wisdom and teachings. The Tao is also known as TAO, a three-letter acronym for the Chinese characters that make up the word.