what do you mean by mass media
Mass media refers collectively to all mediatechnologies, including the Internet, television, newspapers, and radio, which are used for mass communications, and to the organizations which control these technologies.
Mass media play a significant role in shaping public perceptions on a variety of important issues, both through the information that is dispensed through them, and through the interpretations they place upon this information.
The also play a large role in shaping modern culture, by selecting and portraying a particular set of beliefs, values, and traditions (an entire way of life), as reality. That is, by portraying a certain interpretation of reality, they shape reality to be more in line with that interpretation.