An article is a word that is placed before a noun to show if it is specific or general. In English, both the and a (n) are articles that are combined with nouns to form noun phrases. An article is used to indicate that a noun is a noun without describing it. For example, in the sentence Nick bought a dog, item a indicates that the word dog is a noun.
Articles can also modify anything that acts as a noun, such as a pronoun or a noun phrase. The use of articles in English can be tricky, but it's important to understand the rules for using indefinite and definite articles correctly. Indefinite articles are used to refer to things for which the speaker and the listener do not know the identity. If the noun that comes after the article begins with a consonant sound, the appropriate indefinite article to use is 'a'. The definite article (the) is used before a noun to indicate that the identity of the noun is known to the reader. When using possessive pronouns and articles together, readers may be confused.
Therefore, according to the rules applicable to the counting of nouns, the word drop would use the articles a or the. Many nouns (including some that fit into the above categories) can take an article only in some cases, depending on how they are used in a sentence. If you're a native speaker, you'll probably know which article to place in front of a noun without having to think about it. But if you're learning English as a second language, it's important to understand how articles are used. To understand how items are used, it is important to know that nouns can be counted (can be counted) or not counted (indefinitely in quantity and cannot be counted).
Learn more about the articles by visiting the University of Toronto page on special cases in the use of the definite article.