Steemit is all about sharing informative content and get upvotes, which will help you to gain reputation in the community and let you earn a great amount of steem dollars. If you want to survive here and make yourself visible to other you have to get a good reputation and good steem power which will automatically makes your account more valuable and powerful.
Buying Steem Power (SP) will help you to gain more voting power and it is a type of investing in your account to make it more valuable. Its value is same as the value of Steem SBD but it is something that can help you to increase the amount of your vote. You can move it back when you want to but it takes time to convert it again to steem called Power Down.
Convert Your Steem Dollars to Steem Power
The most easiest way to go into your built in Wallet that is available in your profile and click on buy Steem or Steem power button.
After New tab opens you can now choose your preferred Currency to send money and choose what you want to buy.
The build in exchange uses the 
After that you have to choose between Steem, Steem Dollar & Steem Power you will receive an address to send the amount.
As per instructions when you send them the amount they will change it to steem power and you will receive steem power.
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