Fake News may take many different forms, but the essential element is always that it is partially or completely false. It may be urban legend, rumor, badly sourced writing, deliberate misinformation, or intended as humor or parody. As an information consumer, it is your responsibility to evaluate news sources for credibility, authority, and purpose, both for your own information needs and to prevent you from accidently sharing fake news to others.
A short video on recognizing fake news from Cybercivics.com.