Question

What you mean by indefinite articles?

Answer 1

 The articles refer to, or introduce, an unspecified noun known as indefinite articles. "indefinite" means "not specific". In other words, we use an indefinite article in front of a noun when we're not referring to a particular person, place, thing or idea, but we want to convey that we're talking about any one person, place, thing or idea.

A and An are the two indefinite articles.