0The English alphabet has 26 letters. In these letters a, e, i, o, and u are called vowels. The remaining 21 letters are called consonants.
'A' and 'An' are called articles. They are used for singular words.
Before a singular word that begins with a vowel letter or sound, we use 'an'.
Examples: an apple, an elephant, an ink pen, an owl, an umbrella
Before a singular word that begins with a consonant letter or sound, we use 'a'.
Examples: a ball, a cat, a dog, a fence, a hen, a joker
