In english there are two types of articles, definite articles and indefinite articles:

Indefinite articles are A and AN, we use them when the noun is unknown, when it's not a specific object.
when the noun begins with a consonant we use a, and an when the noun begins with a vowel (a,e,i,o,u).
Examples:

Definite articles: The is the definite article, we use it when we talk about an object that both the speaker and the listener know. it's common for all the nouns.
Examples:

In some cases we don't use any article, we talk about The article zero. for more details see this lesson: Article zero!

To test your knowledge about this lesson, do this test: Test of Articles a/an and the

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