The Meyers-Briggs personality test recognizes 16 different types of people on the basis of four sets of criteria. These criteria are Introversion versus Extroversion, Sensing versus iNtuition, Thinking versus Feeling, and Perceiving versus Judging. Thus, you get personalities sorted into 16 different types.
Most people (75%) are Extroverts, and there are more Sensing people (75%) than Intuitive ones. Thinking vs. Feeling personality types are equally divided, as are Perceiving vs. Judging types.
The most common category is the ISTJ, which represents 15.6% of the population. However, most managers are ESTJ (9.9% of the population), which is the classic "Type A" personality. The proportion of ESTJ in management tends to increase the higher you climb the corporate ladder. Men are more likely to be ISTJ (19.4% of the male population), whereas women are more likely to be ESFJ (14.1% of the female population).
Most politicians, and a few managers we are told, when profiled on the extended Myers-Briggs test get high scores in Judging, Extroversion and Responsibility, in addition to Knowledge and Sensing, which places them into the JERKS category.
I am an ISTP ( Introverted (90%), Sensing (65%), Thinking (90%), Perceiving (90%), with some intuitive tendences (INTP). I am a member of a category (6.4% of the population) that includes Charles Bronson, Tom Cruise, James Dean, Clint Eastwood, Burt Reynolds, Keith Richards, Charlie Yeager, Frank Zappa and Jean Senteur de Boue.