Here's why:
* "Extro" is actually a combining form - a word part that is used to create new words, often with a specific meaning. In this case, "extro" indicates a "turning outward" or "external orientation."
* "-vert" is also a combining form, meaning "one who turns" or "one who directs oneself."
So, while "extro" and "-vert" are combined to create the word "extrovert," they are not prefixes or suffixes in the typical sense.