What is the difference with firewalld shields up and shields down

What is the function of Shield-up in the taskbar icon (firewall applet)?
firewalld is already enabled.
So, basically what I wanted to know is what is the difference between Shield-up and the default option (shield not up ?)

Best explained here

The TL:DR is

  • shields-up - blocks all connection
  • shields-down - allows connections defined in the zone

The default zone is public where my personal preference - on public networks is drop

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