Primary and Secondary Sources Comparison

 They both are common because they both give you information. Primary source is you were there and secondary source was hearing from something or someone else. For example, primary source would be me witnessing a murder. It is different because you don't get the information by yourself you get it from someone else. A example of secondary source would be me hearing about the murder from the news or on television. A other example would see a animal being slaughtered in a movie. They are both helpful by once again giving you information that you would be looking for.