Indefinite Articles are the words 'A' and 'An'. These articles are used to refer common or non-specific nouns, i.e., not a specific person, place, object, or idea. 7. It can be used before the ...

A and an are the same type of indefinite article ... But note, when we want to be specific, the definite article is needed: The tennis played by Maria Sharapova at Wimbledon this year was awesome.