Matcha is a powdered green tea, which is made by grinding up whole tea leaves. The resulting fine powder is then whisked with hot water to make a drink. This is different to most other varieties of tea, which are made by steeping the leaves in hot water and then removing them before drinking.
Green tea of all kinds is known to be healthy thanks to its high levels of antioxidants called catechins and the presence of L-theanine. Matcha in particular offers even greater nutritional value because the powder is completely dissolved in the water. That means when you drink it, you’re consuming the entire tea leaf and not just the infusion.