== Fermented vs. cultured. == 

 Is the process that changes Green Tea to Pu-Erh best described as fermentation? My understanding of the process is that the tea is cultured  more like milk into yogurt, than grapes into wine. Isn't "fermentation" the conversion of sugar into alcohol and carbon dioxide? Perhaps it is the established term and has a wider meaning than this and I am mistaken, but I imagine most people would have this idea of fermentation as well. Perhaps a line clarifying the difference in meaning would be helpful.