It affects the news you see by only showing you one side of the picture.
Step-by-step explanation:
Most media ARE businesses and will lie to you to get you to take part in their business. People who report with a Bias will only show you one side of the picture so that you contribute to the side they are showing you. For example a business isn't going to tell you the full truth because they may not want to lose business if someone finds out they have rats, instead they may portray something in the media making them look better.