Find out whether the underlined words in the given sentence is ‘definite’ or ‘indefinite’ articles:
That was an interesting point. 

The correct answer is: Indefinite

Indefinite articles A, An (in the sense of 'one' and 'any'). Definite article The (in the sense of 'this' and 'that'. The indefinite article 'a' is used before a consonant sound and 'an' is used before a vowel sound.  'That was an interesting point', here 'an' is an indefinite article.