This document discusses the use of articles (a, an, the) in the English language. It explains that articles are adjectives that modify nouns. The definite article "the" refers to specific or particular nouns, while the indefinite articles "a" and "an" refer to non-specific nouns. It provides examples of when to use each article and gives guidance on using "a" versus "an" depending on whether the following word begins with a vowel or consonant sound. The document concludes with a quiz for the reader to self-check their understanding of article usage.