A summary is a neutral summary of an article or literature. Without duplicating every detail, a summary should educate readers of the overarching idea of a piece. A good summary should also leave enough information for readers to continue their own research. An unbiased summary doesn't claim to be complete or to cover every aspect of the subject. It leaves some room for readers to explore further themselves. Biased summaries tend to be very detailed and explain everything in great depth. They often use jargon words that only people who are experts in the field would understand. These summaries may get lots of views but they will not be helpful to anyone who wants to read more about the topic. It's all right to give your opinion in your summary, but make sure you include some simple statistics or facts to back up your argument. For example, if you're writing a summary about the benefits of having a college degree, you could say "According to studies, people who have this level of education earn on average $50,000 a year". That's a biased summary because it gives the impression that these are the only two options available when in fact there are many other ways to earn a living.