Here's why:
* Vowels in English: The traditional vowels in English are A, E, I, O, and U.
* "Y" as a vowel: While "y" can sometimes act as a vowel (like in "fly" or "happy"), in the word "today," it is pronounced as a consonant, sounding like a "d" sound.
Therefore, the vowels in "today" are "o" and "a".