Steem

• Currency traded on exchanges
• Can be converted into steem power instantly
• Thins on the platform valued in STEEM

Steem Power

• Needed to act on the platform :up/down vote, vote witnesses and comment
• Determines weight of votes
• Can be converted to STEEM in weekly payments over the cours of 2 years
• Half of rewards are given as SP

Steem Dollars

• Redeemable for 1 USD worth of STEEM (currently worth 0.68232235 STEEM)
• half of content rewards given as SD
• Earns interest