‘A’ and ‘An’ are indefinite articles. They are used to refer things which we do not know specifically. They are the same for all genders.
For example: a girl, an apple, an umbrella etc.
‘A’ is used before a word that begins with a consonant sound. All other letters of alphabet excluding vowels are called consonants. Example: a bag, a cat, a drum etc.
‘An’ is used before a word that begins with a vowel sound. Letters a, e, i, o, u of the alphabet are called vowels. Example: an apple, an orange etc.
Examples of Articles
1. This is a ball.
2. I saw an old carpet.
3. That is a kite.
4. There is a beehive.
5. Give me an umbrella.
6. What an ugly picture!
7. I have a little brown puppy.
8. Pass me an apple.
9. We have a red car.
10. Rita is an honest girl.