Request for clarification on Modern Dashboard

Hello Team,

Good evening.

I have a question regarding the Modern dashboard owner. In the screenshot below, we can see three owners: one is admin, the second is System read-only, and the third is myself.

My question pertains to the System (read-only) where 123 dashboards are displayed. Could you please explain the purpose of this, who created these dashboards, and what the implications would be if I were to delete any dashboard from the system dashboard? Will there be any negative effects?