If you’ve been scrolling through social media or watching variety shows in Asia over the past few years, you’ve probably noticed a lot of people referring to each other as “I-type” or “E-type.”
These aren’t just trendy slang—they’re shorthand for two of the core personality dimensions of the Myers-Briggs Type Indicator, the classic personality framework better known as MBTI.
It’s hard to pinpoint the exact moment MBTI went from a niche psychology tool to a full-blown cultural phenomenon across Asia. Whether in Seoul, Tokyo, or Shanghai, people have been swapping these four-letter personality codes like calling cards. Many dating app profiles even include MBTI results alongside height and hobbies.
What Exactly Is MBTI?
The Myers-Briggs Type Indicator (MBTI) was developed in the United States during World War II by Katharine Briggs, a novelist and self-taught personality researcher, and her daughter, Isabel Briggs Myers.
Their original motivation was both personal and practical: they wanted to help women entering the workforce for the first time find jobs that suited their natural strengths and temperaments.
The framework was first published in 1944, but it didn’t gain mainstream traction right away.
For years, it lingered on the fringes of academic psychology, viewed with skepticism by many researchers. That changed in 1962, when the Educational Testing Service (ETS)—a major American educational assessment organization—officially endorsed the Myers-Briggs framework.
From there, MBTI spread into corporate training rooms, schools, and counseling settings.
And today, it’s enjoying a vibrant second life as pop-culture entertainment.
How MBTI Works: The Theory Behind the Letters
At its core, MBTI is rooted in the work of Swiss psychiatrist Carl Jung, specifically his 1921 book Psychological Types, in which he proposed that human cognition operates through four fundamental mental processes:
- Thinking and Feeling — the rational functions we use to make decisions.
- Sensing and Intuition — the perceiving functions through which we take in information.
Jung also noted that these functions operate under two dominant attitudes: Extraversion (outward-focused) or Introversion (inward-focused).
During her own personality research, Katharine Briggs became deeply interested in Jung’s theory and felt that it closely resembled the ideas she had been developing at the time.
Together with her daughter, Briggs spent years translating Jung’s dense cognitive-function theory into a practical, user-friendly questionnaire.
They expanded upon Jung’s eight principal psychological types (4 Mental Functions × 2 Attitude Types) by adding a fourth dimension—Judging vs. Perceiving—to capture how people prefer to organize their outer lives.
The result is four pairs of preferences that combine to form 16 distinct personality types.
The Four Dimensions
- Energy Source (E/I) — Extraversion vs. Introversion: where you draw and expend your energy.
- Information Gathering (S/N) — Sensing vs. Intuition: how you absorb and process the world around you.
- Decision-Making (T/F) — Thinking vs. Feeling: the internal compass you rely on when making choices.
- Lifestyle Orientation (J/P) — Judging vs. Perceiving: your approach to structure, planning, and spontaneity.
The first dimension, Extraversion/Introversion (E/I), isn’t actually about how sociable or outgoing you are. It’s about where you naturally gain and recharge your energy—whether from the external world or your inner world.
The middle two dimensions (S/N and T/F) represent what Jung called cognitive functions. Everyone uses all four functions, but we each favor a unique combination of dominant and auxiliary functions, such as ST or NF pairings.
Finally, the Judging/Perceiving (J/P) dimension reflects how we prefer to engage with the outside world—whether we lean toward the structured, decisive approach of our judging functions or the flexible, open style of our perceiving functions when handling everyday life.
The 16 Personality Types at a Glance
The 16 types are commonly grouped into four broad categories:
- Analysts (NT Types) — INTJ, INTP, ENTJ, ENTP
The strategic thinkers. Logical, innovative, and always questioning how things work, they’re the architects and debaters who push boundaries.
- Diplomats (NF Types) — INFJ, INFP, ENFJ, ENFP
The empathetic idealists. Driven by purpose and connection, they’re natural counselors and motivators who seek meaning, harmony, and ways to make the world a little better.
- Sentinels (SJ Types) — ISTJ, ISFJ, ESTJ, ESFJ
The pillars of society. Practical, dependable, and deeply rooted in tradition, they’re the backbone of society, keeping things running smoothly, often without any fanfare.
- Explorers (SP Types) — ISTP, ISFP, ESTP, ESFP
The spontaneous adventurers. Living firmly in the present moment, they’re resourceful, adaptable, and drawn to hands-on experiences and sensory pleasures.
Extension of MBTI — The Soul Color Test & 64-Type Personality Test
As MBTI has become a trend, many variants have sprung up over the years.
People in Japan recently created a “Soul Color” test, which maps each of the 16 MBTI types to a traditional Japanese color, while people in China pushed the framework even further by introducing the 64-type personality model, adding two new dimensions—Assertive (A) vs. Overthinking (O) and Hot (H) vs. Cool (C)—on top of the original four.
If you still don’t know which MBTI personality type you are, head over to our Free Online 64-type Personality Test and get your result right now.
Or, if you’d like to find out which elegant Japanese traditional hue matches your personality type, along with much more nuanced breakdowns, here’s the feature article: MBTI 16-Type Personality Analysis & Signature Colors
Of course, no personality system—MBTI included—can fully capture human complexity. Your four-or-more-letter type reflects a natural tendency, not a fixed destiny.
Life experience, environment, and personal growth all shape who you become over time. MBTI is not a label, but a helpful tool for self-discovery—a long journey full of changes, and only you can decide where it will lead.
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