An alphabet is a set of letters usually presented in a fixed order which is used for writing the words of a particular language or group of languages
The Spanish alphabet used to have 30 letters:
A, B, C, CH, D, E, F, G, H, I, J, K, L, LL, M, N, Ñ, O, P, Q, R, RR, S, T, U, V, W, X, Y, Z
In 2010, the Academies of the Spanish Language, the Real Academia Española in Spain and the Latin American ones, decided to remove the digraphs Ch, Ll and Rr from the alphabet.
So now the Spanish alphabet has 27 letters.
Letters can be divide to upper case and lower case.