What are two differences between a true tea and herbal tea?

True tea (such as black tea, green tea, and oolong tea) is made from the Camellia sinensis plant, while herbal tea is made from herbs, spices, or other plant materials not related to the Camellia sinensis plant.

True tea typically contains caffeine, an alkaloid which acts as a central nervous system stimulant that can contribute to the tea's flavor while herbal tea is naturally caffeine-free, unless blended with caffeinated herbs like yerba mate or tea leaves like green tea leaves.