There are 26 alphabets and they are further divided into 5 vowels and 21 consonants.

VOWELS:
A vowel is a speech sound made by allowing breath to flow out of the mouth, without closing any part of the mouth or throat (although the lips may ove to create the correct sound, as in creating the sound “o”). Letters of the English alphabet that represent vowels: a, e, i, o, u, and sometimes y.

CONSONANTS:
A consonant is a speech sound made by partially or completely blocking the flow of air through the mouth (using the lips, teeth, tongue, and palate). Letters of the English alphabet that represent consonants include all the letters that are not vowels.

In English language there are 26 alphabets and they are further divided into 5 vowels (a,e,i,o,u)and 21 consonants (remaining alphabets.)

Vowels	a				e				i						o						u
Consonants		b	c	d		f	g	h		j	k	l	m	n		p	q	r	s	t		v	w	x	y	z

The table shows the letters that are vowels and consonants. But the important thing in linking is the sound, not the letter. Often the letter and the sound are the same, but not always.

For example, the word "pay" ends with:

the consonant letter "y"
the vowel sound "a"
Here are some more examples:

Speak these words ->	uniform	honest
begins with the letter	u	h
begins with the sound	y	o

Speak these words ->	though	know
ends with the letter	h	w
ends with the sound	o	o

Sometimes “H” is also used as a vowel as in – honor / hour. Here “H” is silent and pronounced as “O”, as in Orange.

Generally, any word beginning with vowel and having vowel sound, we use “AN” and words beginning with consonant, we use “A”.

There are only two words in English with all five vowels in alphabetical order as under:

1. Abstemious (means moderate in eating and drinking)
2. Facetious (means intend to amuse)