This document discusses the three types of articles in English: indefinite articles (a/an), the definite article (the), and when to use each. The indefinite articles refer to things that are unknown or being introduced for the first time. The definite article is used when the listener knows the specific person or thing being referred to. It is also used with singular nouns when only one exists, such as rivers, oceans, or geographical locations. The pronunciation of "the" depends on whether it is used in its strong or weak form.