Hey Ashley INTJ is a Myers-Briggs personality type. If you take this test (this is a condensed version) it will tell you your "personality type" and explain "you" essentially in detail.
***BTW, Jenny and Astro I took the test twice today and I am actually ISFJ BUT I took the actual written test 2 yrs ago so I must get that out and see what it said THEN!*** Their are 4 different categories - the website will explain further.... I - introverted or E - extroverted N - intuitive or S - sensing T - thinking or F- feeling J - judging or P - perceiving