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"Scoby" is actually an acronym: Symbiotic Culture Of Bacteria and Yeast. And that's exactly what it is! A scoby is the living home for the bacteria and yeast that transform sweet tea into tangy, fizzy kombucha — think of the scoby as the coral reef of the bacteria and yeast world. It a rubbery raft that floats on the surface of the kombucha. Aside from being a home for yeast and good bacteria, the scoby seals off the fermenting kombucha from the air and protects it from outside, undesirable bacterias while it's fermenting.