A media term. An ideal which all newspapers, TV stations and other media should aspire too. This means giving equal air time column inches etc to all sides of the arguement. However in the world of commercial media cartels this ideal is sacrificed on the alter of the profit margin, political influence and self interest.
These days to gain a fair and balanced view of current events it is best to source your news from a number of different sources that offer as wider range of opinions as possible and make your own mind up.
Newscaster "Do you think this war is the correct course of action?"
Man A "Yes blah blah blah"
Man B "No Blah Blah blah"
Station owner "Man A is backed by our major sponsers, ignore man B"