ELI5 Matcha Tea - how do you tell if it’s high quality?

Is matcha Japanese or Chinese? What makes matcha different from other green teas? How is it made? What is the special whisk for? How do you tell if the matcha you’re buying is high quality? How much caffeine is in matcha?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: vertexoflife, appleanche and rivertea

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