This document provides a summary of the use of articles in English. It explains that "a" and "an" are indefinite articles used before singular nouns starting with consonant and vowel sounds respectively. It also explains that "the" is the definite article, which is used before specific cities, countries, rivers, unique things, and some country names where the government is part of the name. It provides examples and exceptions to the usage of articles. The document concludes with a practice exercise testing the use of articles in different contexts.