In Spanish, indefinite articles function similarly to the English words a, an, or some. They are used to identify a non-specific member of a group (referring to "a book" rather than "the book").
Unlike English, Spanish articles must agree in gender (masculine or feminine) and number (singular or plural) with the noun they modify.
In the singular form, the article indicates a single item.
To avoid a clash of sounds, singular feminine nouns that begin with a stressed a- or ha- (including words starting with á-) take the masculine article un instead of una. However, the noun remains feminine, so its plural form uses unas.
In the plural form, the articles generally translate to "some" or "a few."
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