” The Macmillan Dictionary Defines an article as “a sort of determiner (=phrase utilised before a noun) that shows whether you are referring to a selected issue or to your basic illustration of a thing. The indefinite article is ‘a’ or ‘an’ as well as the definite article is ‘the’.” https://onglobetrotter.com/a-tourists-guide-to-switzerlands-stunning-mountains/