Why do we put articles in title or headings?

What difference would it make to add the articles in "A bag of cookies" and "The bag of cookies"?

Another example:

The affection distorts the perception.

Shouldn't it be "affection distorts perception" because it's headlinese?

Why do we see an inclusion of articles in headlinese?

closed as too broad by stangdon, Chenmunka, Glorfindel, user3169, choster Apr 22 '17 at 14:25

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • If your question is "what is the difference between a, the, and no article at all, I think the question is too broad. There are many, many web pages about the use of articles in English grammar. – stangdon Apr 21 '17 at 12:45
  • My question is putting THE in headings.. I am reading a story which titles this "the affection distorts the perception" can't it be affection distorts perception – Adil Gul Apr 21 '17 at 13:18
  • What headline where? Can you add some links or screenshots showing this? Headlinese is primarily used for brevity (in the case of printed news or news summary web pages) or for impact (making bait words stand out). It is a matter of writing style, not of language itself. – user3169 Apr 22 '17 at 0:26