The Alphabet, also known as the ABC's, is a series of all the letters in the American language. Any other symbols, like ß or Y (a flip-flopping letter that can't decide whether it's a consonant or vowel), are part of the Wordonista terrorist attacks on America and an attempt to get us to read books.
The order and exact letters of the alphabet are unimportant and left to factinistas to argue over on the Wikipedia. The only letters you really need to know are C, O, and W. These letters also accidently spell cow. Cows are awesome and delicious.