When we first join steemit we are new fish in the sea called minnows and really don't have any idea about the environment. So it is a big step into the unknown and for that each of us should be commended.
The funny thing is though if you are continually paying attention in this environment a person cannot help but continually be repeatedly put face to face with education. This inculcation with education is entirely different than the indoctrination of our societies and schools. Indoctrination encourages obedience to authority. The steemit environment encourages self rule and the following of one extremely important law. "Harm No One!" Thus it is liberating as anything becomes doable as long as what you are doing doesn't Harm Anyone.
This encourages education because knowledge is valuable and we get steem for providing value to the steemit pool.
A steemit witness guards, improves, maintains the steemit pool. Let's make this personal and say it in a metaphoric way. The witness guards your pool, improves your pool experience by providing new tools and education for the pool and maintains the pool security and the upkeep of the servers that create the virtual world of steemit. In short s/he is the guard of all our dreams and provides vision, tools and education!
@dragosroua has a much better post, and indeed at the bottom of each post a plethora of educating posts, and he has a much better explanation for this than I do.
I voted for him and you should vet him for yourself!
I had a conversation with @dragosroua on one of his very informative posts. I didn't know what he was talking about when he said "Delegated Proof of Stake" in that post. So I looked it up and you can see some of what I found by clicking here. DELEGATED PROOF-OF-STAKE HAS ITS MERITS.
Along the way I found another context that was important to understanding the environment. Proof of Stake vs Proof of Work vs Proof of Burn gives a fuller understanding of the concepts involved. In the research to find out about what he was talking about I discovered why witnesses want to protect me and you.