Green tea is one of the six Chinese tea categories. The main difference compared to other tea types like black tea or Oolong is that green tea leaves are not oxidized. Furthermore are for green tea rather the leaves of Camellia sinensis var. Sinensis instead of Camellia sinensis var. Assamica preferred because the small-leafed variety is more delicate and therefor better suited. Green tea differs from black tea among other things, in the preparation, flavor, the ingredients and the effects of the infusion. So green tea is rich in polyphenols similar as to be degraded by the oxidation part white tea during this when [black tea] [black tea].
Japanese green tea
Japanese green tea is steamed instead of roasted and the infusion temperature is mostly lower compared to Chinese tea. The tea production in Japan is to a large extent made by harvest machines.
Chinese green tea
Green tea has a long history in China. Therefore, the variety is huge. Here is a small selection: