Articles are very important in the English language. They are words which can be used with nouns to specify or indicate their limit. Articles can be used to specify a noun in terms of its size, volume, definiteness, and scope. There are two types of articles in the English language; definite and indefinite articles.
However, there are some differences between a definite article and an indefinite article. A definite article is a word that precedes a noun, which indicates or specify the particular noun that is being discussed or considered. A definite article is used when you want to be specific about a specific noun or a class out of many courses. An example of a definite article is 'The.' Indefinite articles, on the other hand, are words that precede a noun and which indicate or specify that the noun is referring to any member of the class of objects mentioned by the noun. Examples are 'An and A.' While 'an' is used together with nouns starting with vowel sounds, 'a' is used together with nouns beginning with consonant sounds.