Each letter in the personality type code - E, S, T, and J - describes a preference for a way of thinking or behaving. There are eight styles and you use all of them, but ESTJs prefer:
Extraversion (interacting with people) more than Introversion (thinking things through)
Sensing (perceiving tangible facts) more than iNtuition (perceiving new possibilities)
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 ESTJ then you want the world to be well run and well organised. You are keenly aware of the need for structure in a situation, such as the roles and responsibilities that people have. If there are no established processes or procedures, or in a situation of chaos, then you will introduce a logical organisation and structure into the way things are done. You are likely to be businesslike and professional in your manner.
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.