English Alphabet

The modern English alphabet is a Latin alphabet consisting of 26 letters (each having an uppercase and a lowercase form) – the same letters that are found in the ISO basic Latin alphabet: It has 26 letters

The letters A, E, I, O, and U are considered vowel letters, since (except when silent) they represent vowels; the remaining letters are considered consonant letters, since when not silent they generally representconsonants. However, Y commonly represents vowels as well as a consonant (e.g., "myth"), as very rarely does W (e.g., "cwm"). Conversely, U and I sometimes represent a consonant (e.g., "quiz" and "onion" respectively).

W and Y are sometimes referred as semivowels.
Source: https://en.wikipedia.org/wiki/English_alphabet
https://en.wikipedia.org/wiki/English_alphabet