Articles are a type of determiner, which are words that come before nouns to specify them. They are not nouns or pronouns themselves.
Here's why:
* Nouns name people, places, things, or ideas (e.g., dog, park, book, happiness).
* Pronouns replace nouns (e.g., he, she, it, they).
"A" helps to specify the noun that follows it. For example:
* A dog (the noun is "dog")
* A park (the noun is "park")