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Reddit for rich people! I love it!

SBD stands for Steem Backed Dollar, which is old name for Steem Dollar.

So why is there STEEM, STEEM POWER, and SBD instead of a single currency?

I think this is because steemit desires to attract users from outside crypto currency, and the SD works well in that regard

Coin Marketplace

STEEM 0.17
TRX 0.16
JST 0.029
BTC 75912.93
ETH 2909.01
USDT 1.00
SBD 2.60