Powering Up - If you wish to gain more influence in the network, you need it increase your Steem Power. Powering Up is the process of turning your Steem into Steem Power.
Powering Down - If you have Steem Power, and wish to cash out, you can begin to Power Down. While powering down, the network has calculated your Vests, which are a stable measure of STEEM supply. The system will transfer 1/104 of your Steem Power, computed as Vests, to STEEM each week. One can continue to curate and earn curation rewards while powering down.