The document discusses the use of articles in English grammar. It defines articles as a subclass of determiners that specify nouns. There are three articles in English: a/an and the. The is the definite article as it refers to specific nouns, while a/an are indefinite articles that do not refer to particular nouns. The rest of the document provides examples of when to use the definite article "the" with unique things, places, events, directions, and other nouns to indicate specificity or familiarity.