When I was working at NCAR, we were offered seminars of interest to us, and one I took long ago was the Myers-Briggs Type Indicator (MBTI). (The link takes you to Wikipedia.) After we signed up, we were sent questionnaires of 180 questions to answer a week before the day-long seminar, and I filled it out thinking this would be an interesting day. It was.
The premise is that people basically have two opposite ways of viewing the world in four categories: introvert/extravert, thinking/feeling, sensing/intuition, perceiving/judging. Here is a graph showing how people line up up in 16 categories:
The she gave us back our long questionnaires, and guess what? ENFP. Most people are not all the way one direction or the other, but I was way out on the extraversion side, and also moderately strong on intuition and feeling, and pretty balanced, but still a perceiver rather than a judger.
The Myers-Briggs website gives YOU a chance to find out where you fit into this typology, if you're interested. I have used it to find out why I have such a hard time with some people. I have a hard time with strong sensers, and I am attracted to introverts (they are a great audience!). Enjoy!