Cao is a common surname in China, often associated with various historical and cultural figures. One notable person with this surname is Cao Cao, a prominent warlord and poet during the late Eastern Han dynasty. He played a significant role in the Three Kingdoms period, which is a popular subject in Chinese literature and media. In addition to its historical significance, "Cao" can also refer to a type of traditional Chinese tea, known for its unique flavor and health benefits. This tea is often enjoyed for its calming properties and is part of the rich tapestry of Chinese tea culture.