There are 5 alphabets out of this 26 which stand out. They are the vowels - a, e, i, o, and u. And sometimes, only sometimes, "y" is considered to be a vowel.
This is in sharp contrast to consonants - a speech sound produced by a partial or complete obstruction of the air stream by any of various constrictions of the speech organs.
Let's play a short memory game.
This is the Vowel Brigade.