There are basically four forms of mass communication largely known or categorized by the media industry as well as institute.

1. Journalism :- it can be print journalism, like you newspaper's, tabloid, magazines, weekly newsletters etc. As well as the electronic journalism which includes radio as well as television news channels.
2. Advertising:- it includes all form's of advertisements, whether used as social message or commercial message to communication about a cause or product.
3. Public relation:- all the news about the companies, market and organization in the market. Their corporate social responsibility and their corporate communication. Which is done as image building and repo building. Between the employees and employer. Between people and organization. Between company and its customers or investors. Brand building, image building and marketing communication are also part of it.
4. Film :- all the biography films, feature films, entertainment films, documentary films, shows, and what all you see as series too is a very impact full mass communication method

Hi

Mass Media forms are basically called as specialisations. Mass media is a vast sector, which broadly includes,

1. Television- News anchoring, news producer, reporter
2. Radio- Radio jockey, script writer, radio new presenter
3. Print- editor, journalist, news script writer
4. Web or Digital


Hope this helps