White tea, green tea, black tea and black tea are four completely different kinds of tea, which can be distinguished from each other by their most fundamental properties. White tea is slightly fermented tea, which is cool and mild in the later stage, and has the characteristics of more fragrant with aging and changeable taste. Green tea is non-fermented tea, which is cold and has the characteristics of clear soup and green leaves. Black tea is a fully fermented tea, which is mild and often loose tea, with rich and sweet characteristics; Black tea is a post-fermented tea, which is mild in nature, dark in color, compact and coarse in texture, and mostly brick and cake-shaped. In addition, their processing techniques are also different, and their drinking methods and suitability for people are also different. White tea, green tea, black tea and black tea are four completely different kinds of tea, which can be distinguished from each other by their most fundamental properties. White tea is slightly fermented tea, which is cool and mild in the later stage, and has the characteristics of more fragrant with aging and changeable taste. Green tea is non-fermented tea, which is cold and has the characteristics of clear soup and green leaves. Black tea is a fully fermented tea, which is mild and often loose tea, with rich and sweet characteristics; Black tea is post-fermented tea, which is mild in nature, dark in color, compact and coarse in texture, and mostly brick and cake-shaped. In addition, their processing techniques are also different, and their drinking methods and suitability for people are also different. White tea, green tea, black tea, oolong tea and black tea are all treated in different ways. They are different in appearance, fragrance, taste and heat. White tea: produced in Fujian Province, China, it is made by air-drying or sun-drying without fermentation and rolling. It is silvery white in appearance, light in taste, short in storage time and rich in vitamin C and other ingredients. Green tea: The tea-making process is enzyme fixation, rolling and drying without fermentation. Green tea is green and bright in appearance, fragrant and refreshing in taste, and rich in tea polyphenols, catechins and other ingredients. Black tea: commonly known as "black tea", it is processed by rolling, fermentation, drying and other steps. Its appearance is reddish brown, its taste is mellow and sweet, and its tea polyphenols content is high. Oolong tea: a kind of tea between green tea and black tea, which is made by rolling and semi-fermentation. The tea leaves are dark in color, curly and fragrant in appearance, and mellow and sweet in taste. Black tea: also known as Pu 'er tea, it has a long fermentation time and is made through specific fermentation and preservation processing technology. Tea is dark brown in color, thick and sweet in taste, and suitable for storage in Fang Chen.