Each letter in the personality type code - I, N, T, and J - describes a preference for a way of thinking or behaving. There are eight styles and you use all of them, but INTJs prefer:
Introversion (thinking things through) more than Extraversion (interacting with people)
iNtuition (perceiving new possibilities) more than Sensing (perceiving tangible facts)
Thinking (making decisions using objective logic) more than Feeling (making decisions using subjective values)
Judgement (an organised lifestyle) more than Perception (a flexible lifestyle)
If your closest personality type is INTJ then you have a strong, private sense of strategic vision, both for the future and how that future can be achieved. Your vision, or sense of knowing, may be difficult to articulate. Others may find your vision difficult to accept, seeing it as impractical or unrealistic. Pursuing your vision might be a lonely task, therefore, as you develop and pursue plans without anyone else really understanding the nature of what you are trying to achieve.
Stereotypes and Individuality
The original author of personality type theory - Carl Gustav Jung - said that everyone is individual and unique. The personality types are not strict classifications, but stereotypes that are akin to landmarks on a map. Just as a few landmarks can help you find many unique locations, so too the personality stereotypes can help you understand your unique personality.