A" and "an" are indefinite articles or blog posts that precede nouns or the adjectives modifying nouns. In English grammar, "a" and "an" are determiners, that means they specify the id or quantity of a thing, and for both terms, that amount is "one"—the word from which They are derived. https://theprettierlife.com/discovering-your-dream-home-with-heather-fabris-real-estate-your-trusted-guide-in-realizing-your-vision/