According to Dictionary.com, the definition of bias is:
a particular tendency, trend, inclination, feeling, or opinion, especially one that is preconceived or unreasoned:illegal bias against older job applicants;the magazine’s bias toward art rather than photography;our strong bias in favor of the idea.
unreasonably hostile feelings or opinions about a social group; prejudice:accusations of racial bias.
What news sources are trustworthy? Which are notoriously biased? Answer these questions and more by looking at this news graphic created by Vanessa Otero. This is a great visualization of of where current news/media outlets fall on the current political spectrum.
This example of a headline from two years ago illustrates loaded language, direct tone & favoring one side. The part "full on assault" and "stands by her views" gives an extreme emotional response. The reader automatically feels sympathy for this person.
This is also a great example of direct tone. The headline misuses quotes here. In this context the quotes suggest sarcasm. This means the writer is insinuating that liberals aren't tolerant at all.
This writer is firmly on the woman's side and does not give any information from the other side or any witness accounts. This writer want thier readers to feel sympathy and is not both sides or all the facts.
The headline on the right shows an absolute difference. This headline is neutral and is not taking a side and is not leading the reader to a particular side.