This document provides examples and explanations for using the definite and indefinite articles "the", "a", and "an" in English. It explains that "the" is used for things that are specific or already mentioned, while "a/an" is used for general or non-specific things. It gives examples of when to use each, such as "the sky" but "a star". It also lists cases when no article is used, such as with countries, languages, meals, professions and years. The document concludes with a quiz testing the use of articles.