What's the difference between "a" "an" and "the"?

Answer 1

a/an are indefinite articles, and the is a definite article

Indefinite articles are used to refer to a noun for the first time or refer to an unspecific class or member of a group. You use the indefinite article "an" only when the next letter is a vowel or makes a vowel sound. Examples:

1. A boat
2. An article
3. An honor

The definite article "the" is used to refer to a noun that the listener is assumed to already know. As well, it is used for specific titles, people, or eras

Examples:

1. The '70s
2. The CEO of Amazon
3. the article

Answer 2

"A" and "An" is indefinite and indicates generality. "A" is used when the first letter of the word following it is consonant. If it is vowel, then use "an". "The" is definite and indicates particularity. They are usually referring to specific noun.

'A', 'an' and 'the' are the articles which are used before nouns.

1. 'A' : used before a noun being referred that is not already known to the speaker, listener, writer and/or reader. Also, the noun has a consonant sound.
2. 'An' : It is same as 'a' but the noun here has a vowel sound.
3. 'The' : used before a noun being referred that is already known to the speaker, listener, writer and/or reader.