Sort:  

A whale = an account holder who has a very large amount of some asset, enough so that selling it all at once could significantly impact market prices.

There is a mining process analogous to how Bitcoin is mined, but unlike Bitcoin there is no upper limit to the amount of Steem that can be created. You should read the whitepaper; it covers this topic in great detail.

Coin Marketplace

STEEM 0.18
TRX 0.16
JST 0.029
BTC 62504.18
ETH 2430.44
USDT 1.00
SBD 2.60