In brief, the main difference between articles and determiners is that determiners are a group of words we use to describe nouns, whereas articles are a subcategory that falls under determiners. Simply put, in the English language, not all determiners are articles, but all articles are determiners.

Is a a determiner or an article?

Definite and Indefinite Articles

Articles are among the most common determiners. There are three singular articles: a, an and the. Articles specify (or determine) which noun the speaker is referring to.

Is a, an and the determiner?

A, an, and the are types of determiner called articles, which introduce and provide context to a noun or noun phrase. Articles are among the most common of the determiners.