These terms are easily confused with common English words. They don't necessarily mean what we expect them to mean:
E -- Extraverted: turned toward the outer world, of people and things. An extravert, or extraverted type, is one whose dominant function is focused in an external direction. Extraverts are inclined to express themselves, using their primary function, directly.
I -- Introverted: turned toward the inner world of symbols, ideals and forms. An introvert, or introverted type, is one whose dominant function is inwardly focused. Introverts are inclined to express themselves, using their primary function, indirectly, through inference and nuance.