Articles are words used before nouns to show whether the noun is specific or general.
There are two types of articles: definite and indefinite.
The is the definite article used for a particular noun that is already known to the listener or reader.
A and An are indefinite articles used when talking about something for the first time or something not specifically identified.
Example: “She saw an owl sitting on the tree.”
In this example, ‘an’ is used before a noun starting with a vowel sound.