a - an - the indefinite articles

Definite artilcles are used in specific nouns, for example:
the red apples of the basket
the Mexican people
the cold water

Indefinite articles are those that represent a general group

apples
People
water

Time to practice:
Select acrticle THE or no article

The indefinite article "The"

Definite or Zero article?

In case you have any doubts, here's a video where you can learn more about the articles: