An article is a word that combines with a noun to indicate the type of reference being made by the noun. An article is sometimes called a noun marker also. There is two types of artic le: 1) Indefinite ( a,an ): Indefinite article refer to something not specially known to the person you are communicating with. There are only used before a singular countable noun. 2) Definite ( the ): Definite article used to point out some particular person or thing. " The " is used before a singular or plural noun, whether countable or uncountable, when that noun is specially identified or its identity is already understood. It means there are just three articles in English - a, an and the. USAGE OF A: ☺ Article a is used before a consonant for example - a boy, a bird, a rose etc. ☺ It is also used before such vowels that have sound of "you" for example - a university, a European etc. ☺ a is used When "O" sound lik "W" , for example - such a one, a ...