The definite article “the” is like a spotlight; it is used before a specific noun that both the speaker and the listener know about.
The cat is sleeping on the sofa.
We visited the Eiffel Tower in Paris.
Indefinite Articles “A” and “An”:
The indefinite articles “a” and “an” are like introducing someone or something new; “a” is used before words that start with a consonant sound, and “an” is used before words that start with a vowel sound.