Most people engaged in academic research differentiate among categories of periodicals -- academic journal, popular magazine, news magazine, newspaper, etc.
Lots of academic libraries have prepared guides intended to help a reader determine the type of periodical. For example, here are guides from Skidmore and Purdue.
How can you find out which periodicals to which we have direct access?
This also will help you identify databases which cover articles from the publication(s) in which you are interested.
Why don't we have everything? An example:
We have a collection of databases that are useful for locating articles from newspapers and magazines. In this class session, we are focusing on newspaper databases.
Note that some of these databases include broadcast transcript sub-sets.