Is the word a definite article or indefinite article?

The word "a" is an indefinite article. It is used before singular countable nouns and refers to any one of a group of things.

Here's the difference between definite and indefinite articles:

* Indefinite articles (a/an): Used when talking about something general or unspecified.

* Definite article (the): Used when talking about something specific or already known.

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