What it means is that journalism plays a role in upholding a democratic society. It’s a pretty important role that shouldn’t really be taken lightly.
Basically, we have the administrative, which consists of the prime minister and the cabinet of ministers, who administer the government. We have the legislative, the parliamentarians who create and debate the laws of the country. We also have the judiciary, which upholds the laws in the country.
So the fourth arm is journalism, which consists of reporters, editors, and news organisations that act as watchdogs of the rest.
The stories that they report are what should be informing the public of the goings-on of the government that they voted for. Basically, keeping an eye out to see if they are doing things correctly or not.
Without journalism, the other three arms...