Here's why:
* It's a foreign letter: The Spanish alphabet is based on the Latin alphabet, which doesn't include "x" as a standard letter with a specific pronunciation.
* It represents "ks" sound: When "x" appears in Spanish words, it's usually pronounced as the combination of the sounds "k" and "s".
* Examples:
* México: pronounced "meh-hee-koh"
* examen: pronounced "eh-sah-men"
* taxi: pronounced "tah-see"
So, instead of having its own sound, "x" in Spanish acts as a shorthand for the "ks" combination.