Question

The indefinite article 'a/an' is used with countable nouns.

Answer 1

Article Basics:

The articles "a" and "an" are indefinite articles. They are used with a singular countable noun when the noun referred to is nonspecific or generic.

Examples :

1. I need a phone.

2. I saw an elephant.

In the above examples both the nouns (phone and elephant) are countable noun.