Introversion and extraversion are directions of energy, not social skill
Introversion is often reduced to being unsociable, and extraversion to being talkative. Jungian thought goes deeper: does psychic energy move mainly toward the inner subject or the outer object? A person can be talkative and introverted, quiet and extraverted.
Extraversion is drawn by the object
An extraverted attitude is more readily awakened by the outer world: people, events, chances, feedback, and atmosphere. Its strength is entering reality and responding to the object.
When unbalanced, extraversion can depend too much on outer recognition and lose touch with the deeper inner position.
Introversion is drawn by the subject
An introverted attitude returns more readily to inner judgment, meaning, feeling, and imagination. Its strength is protecting an inner standpoint from being swept away by the room.
When unbalanced, introversion can become trapped in its own interpretation and resist correction from reality.
Pressure reveals direction
In ordinary life, both directions may be available. Under pressure, the preference becomes clearer: one person reaches for outer response, another withdraws to organize inside.
The point is not classification, but the question: when do I need to return to myself, and when do I need renewed contact with reality?