Examples of primary sources: Mass media
"Mass media" is a deceptively simple term encompassing a countless array of institutions and individuals who differ in purpose, scope, method, and cultural context. Mass media include all forms of information communicated to large groups of people, from a handmade sign to an international news network. There is no standard for how large the audience needs to be before communication becomes "mass" communication. There are also no constraints on the type of information being presented. A car advertisement and a U.N. resolution are both examples of mass media.