A Detailed Overview and Usage of English Article:

There are two articles in English language:

  1. Definite Article
  2. Indefinite Article

Definite Article

is the word "the" which is used as a prefix to certain other words especially nouns to specify them. Therefore, the role of "the" is to mark somebody or something. For example "the chair" is a particular chair. Hence, the article "the" tells us about definite things.

Indefinite Article

are "a" and "an" both denote one. But in comparison to "the" these denote general things or persons which are not specific or particular. For example " A dog" denotes any dog in the world.