Bias referes to a tendency to believe that some people, ideas, etc., are better than others, which usually results in treating some people unfairly. When evaluating sources, it is important to look for and recognize bias so as not to confuse a writer's opinion with facts. It is equally important to be aware of your own biases so that you don't discount credible sources just because they differ from your opinions.
A quick and easy method for evaluating websites, SPAT stands for:
SITE
PUBLISHER
AUDIENCE
TIMELINESS