Matcha is a high-grade green tea ground into powdered form. The green tea powder is whisked into hot water, instead of steeped, to form a frothy drink. Matcha, like all true teas, comes from the leaves of the Camellia sinensis plant. How the tea leaves are cultivated and processed is completely different than any other tea. Matcha typically has more caffeine than green tea, similar caffeine to black tea, and less caffeine than coffee.