Mass media is a term used to denote a section of the media specifically envisioned and designed to reach a very large audience such as the population of a nation state. It was coined in the 1920s with the advent of nationwide radio networks, mass-circulation newspapers and magazines, although mass media was present centuries before the term became common. The term public media has a similar meaning: it is the sum of the public mass distributors of news and entertainment across mediums such as newspapers, television, radio, broadcasting, which require union membership in large markets such as Newspaper Guild and AFTRA, & text publishers. The concept of mass media is complicated in some internet media as now individuals have a means of potential exposure on a scale comparable to what was previously restricted to select group of mass media producers. These internet media can include television, personal web pages, podcasts and blogs.

The communications audience has been viewed by some commentators as forming a mass society with special characteristics, notably atomization or lack of social connections, which render it especially susceptible to the influence of modern mass-media techniques such as advertising and propaganda. The term "MSM" or "mainstream media" has been widely used in the blogosphere in discussion of the mass media and media bias.