when to use definite articles and when to use indefinite articles code example

Example: when to use definite articles and when to use indefinite articles

Articles are used before nouns or noun equivalents and are a type of adjective.
The definite article (the) is used before a noun to indicate that the identity of the noun is known to the reader.
The indefinite article (a, an) is used before a noun that is general 
or when its identity is not known.