‘a’ and ‘an’ are articles.Articles are a class of words which specifically identify a word as a noun and confirms that it is not a describing word or adjective. There are two types of articles: the definite article the and indefinite articles a and an. When the is used before a noun, it refers specifically to a particular noun e.g. the boy; a or an refers to a general class of the noun e.g. a baby could be any baby; whereas the baby refers to a particular baby.
When to use a or an before a word
Figure of speech: Play second fiddle
This means letting someone else take charge whilst you take an inferior or low position.
Example: Playing second fiddle to anyone was not in Princess Iyomon’s nature; she determined that she would put bossy Ozin in his place when they worked together on the project later that day.