What is a witness?
I am learning about Hive, so i thought I would ask a bit about what a witness does? I am just looking at making some witness votes and also the top witnesses here:
I am guessing the price feed and the time is the last time they were active? I can see that all the top witnesses seem to be pretty active and doing whatever it is they do?
The next top 20 Now some of these next lot of witnesses are not so active, I mean one says 4 years why do people still vote for this witness? 
So what?OK I can keep on strolling down the list but it is odd some of them are not active and still have votes? Do witness get rewarded for their position or just the work they do? I am curious to know before casting any votes. So in summary1. What does a witness do?2. Why are some people still in the list when they not doing anything?3. How do they get rewarded and how much?
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