Thank you @clshipp91 for commenting. Bots are useful to promote your posts, useful because they can fund Steem project and useful because whales can invest in them. A witness is a Steem user who has a server and run the Steem blockchain, it is like mining for other crypto. You can vote for them and the top 20 can influence new updates for Steem.
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Gotcha gotcha, so kind of like a master node then. Thanks for clearing that up for me!