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The same as Steem Dollars - Steem Backed Dollars.

Ah okay, but I was under the impression Steem Dollars were pegged to the dollar and Steem was volatile... how come STEEM is stable but SBD was $14?

SBDs are always trying to be pegged to a $. The peg is apparently easier to push up than pull down, which sounds like, on the face of it, a benefit to all of us here :)

Indeed, thanks for the help, joined yesterday and still learning the ropes.