Each letter in the personality type code - I, S, F, and P - describes a preference for a way of thinking or behaving. There are eight styles and you use all of them, but ISFPs prefer:
Introversion (thinking things through) more than Extraversion (interacting with people)
Sensing (perceiving tangible facts) more than iNtuition (perceiving new possibilities)
Feeling (making decisions using subjective values) more than Thinking (making decisions using objective logic)
Perception (a flexible lifestyle) more than Judgement (an organised lifestyle)
If your closest personality type is ISFP then you have some deeply-held values that, even though your life may be somewhat unstructured, direct the things that you do and say. You probably take a caring and sensitive approach to others, more so than may be apparent to others because you showing your feelings in acts of kindness rather than in direct statements. You probably have a strong sense of the type of lifestyle you enjoy, which you want to maintain.
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.