The word “a” is an article. More specifically, “a” is one of the two indefinite articles (“a” and “an”).
Indefinite articles modify general versions of singular and countable nouns (e.g., “a bicycle” means “any bicycle” whereas “the bicycle Mia got for her birthday” refers to one specific bicycle”).
Use “a” before the noun it modifies, the first adjective that modifies the noun, or the adverb that modifies the noun’s first adjective.
Use “a” instead of “an” when the next word begins with a consonant sound (e.g., “She wore a gold necklace”).
QuillBot’s free Grammar Checker can help you use the indefinite article “a” correctly in your writing.