Fake News: What is fake news?

Fake news  n. 
“…news that conveys or incorporates false, fabricated, or deliberately misleading information, or that is characterized as or accused of doing so.”

Oxford English Dictionary - 2019

So "fake news" can be information that is actually untrue, or it can be used as term, as propaganda, by people who don't agree with, and who want to discredit, the real facts.