How does the word sound?
"An" is used instead of "a" when the following word starts with a vowel sound. Vowel sounds are the sounds of the letters a, e, i, o, u.
A modification of the meaning of the next word and indicates one (any) person, thing, etc but not a particular one. Can modify a large number of words.
Examples of how the word is used
|An apple a day keeps the doctor away.|
|Even though an eel may look more like a slithering snake, it is a fish.|