An article is a part of speech used before nouns or noun equivalents and are a type of adjective. They are words that define a noun as specific or unspecific. The three articles in English are: the, a, an.
"The" is considered the definite article, is used before a noun to indicate that the identity of the noun is known by the reader. Example: The apple is incredibly juicy. (talking about a specific and known apple)
"A" and "an" are indefinite articles used before a noun that is general or when its identity is unknown. This article can be used for cont nouns only. Example: An apple is incredibly juicy. (talking about a generic apple)
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