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What does "System Mapping" mean in a Channel Tag

Question asked by Denise Greenberg on Apr 5, 2019
Latest reply on Apr 6, 2019 by Jay Jiang

I feel like I should know this already but I don't. I'm working in a Marketo instance new to me and any event channel pre-existing or that I create has this "System Mapping" column:


And notice that I can't delete any statuses other than the first and last. What does this mean and where does it come from?


Thank you!