No bad or good preferences, only different. Have different interests, ways of behaving, ways of viewing the world, strengths and areas of needed growth. Measure of how confident we are that you were able to see your preferences clearly in the questions. Higher score does not show you are better at the skills of your preference than someone with lower scores. It is your preference for one or the other side of the scale that is important, not the size of the score.
Extraverts use dominant in outside world.
Introverts use dominant in inner world. Ranks second in importance. Is the other of the two middle letters. Helps you balance extraversion and introversion. Understand and appreciate ourselves.