For additional practice on this topic at this age group, you may also find our KS3 English revision quizzes useful.
There are 26 letters in the English alphabet: 21 consonants and 5 vowels. A vowel has certain characteristics which are different from those of a consonant. Two main differences are that generally no word can be spelt without a vowel (or a consonant representing a vowel sound) in it. Since a vowel has to be present in a word it implies that pronunciation will also carry the sounds of a vowel. The other difference is that the ways of producing a vowel sound are distinct from the ways of producing a consonant sound.