The indefinite article (a, an, some) is used before a noun that is general (unspecific) or when its identity is not known.

​Indefinite articles - a, an, some

They refer to something specific.

​In English, there is only one definite article: the. In Spanish, you have four definite articles: el, la, los and las.

​Definite articles -the

In Spanish, as in English you have two types of articles:

The indefinite articles in English are a, an, one, some.

For example:

a book

an apple

some pencils

​Indefinite articles

​Indefinite articles in Spanish just like definite articles, follow the gender (m/f) and number (singular/plural) agreement. The indefinite articles in Spanish are:

un, una, unos, unas

​Spanish Indefinite Articles

Un and una mean a/an in English.

​un is used before masculine singular nouns.

un niño - a boy

una is used before feminine singular nouns.

una niña - a girl

Un/una are also used to indicate amount.

un/una = 1

​Singular Indefinite Articles

Unos and unas mean some/a few in English. For example:

unos libros - some books

unos is used before masculine plural nouns.

unos niños - some boys

unas is used before feminine plural nouns.

unas niñas - some girls

​Plural indefinite articles