This is the power of ownership in the network which gives strength to your steemit profile. If you have more steem power, then your upvotes can count most for the value.
This cannot be sold for two years, so you have to grow your money in the long term.
What is Steem dollars?
Steem dollars (SBD) are liquid state value currency token designed to exchange in real USD. You can use these steem dollars in other accounts for exchange or trading.
This is the stable currency which can be sold at any time, unlike steem. You can not use steem dollars as real money without converting them into bitcoin or USD.
Convert 1 SBD to US Dollar (USD)