As explained in this article, witnesses are fundamental elements in the Steem ecosystem.
This tool allows you to see which accounts are voting for which witnesses, and where any witnesses votes are coming from, and who their biggest contributors are. It also shows which contributions are coming through proxy votes.
http://www.steemreports.com/witness-votes-info
You can selected which witnesses you vote for here.
Some people prefer not to vote for witnesses directly, but instead entrust that to another account. By setting a 'voting proxy' your witness votes are chosen by the nominated account. Feel free to ask any further questions about this below.
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