The 16 personality types describe preferences in how people direct their energy, take in information, make decisions and organise their lives. Each type is a four-letter code, such as INFP or ESTJ. Below you will find every type, what the letters and functions mean, and a full guide to each one.
Not sure of your type yet? Take our free 16 personality types test first.
All 16 Types At A Glance
| Type | Nickname | In one line | Share of people* |
|---|---|---|---|
| INTJ | The Strategist | Plans years ahead and improves systems | About 2% |
| INTP | The Theorist | Asks how things really work | About 3% |
| ENTJ | The Director | Sets goals and organises people to reach them | About 2% |
| ENTP | The Inventor | Generates ideas and tests them in debate | About 3% |
| INFJ | The Counselor | Reads people deeply, works toward a vision | About 1.5% |
| INFP | The Idealist | Lives by inner values, expresses them creatively | About 4% |
| ENFJ | The Mentor | Brings people together and helps them grow | About 2.5% |
| ENFP | The Spark | Warm, curious, full of possibilities | About 8% |
| ISTJ | The Inspector | Dependable, exact, loyal to commitments | About 12% |
| ISFJ | The Guardian | Cares through quiet, practical help | About 14% |
| ESTJ | The Organizer | Turns plans into schedules and results | About 9% |
| ESFJ | The Host | Makes people welcome, keeps groups in harmony | About 12% |
| ISTP | The Craftsperson | Calm troubleshooter who learns by doing | About 5% |
| ISFP | The Artist | Gentle, aesthetic, true to personal values | About 9% |
| ESTP | The Dynamo | Bold, practical, quick to act | About 4% |
| ESFP | The Performer | Lively, generous, fun in any room | About 8.5% |
*Rounded estimates from a large United States sample published in the third edition of the MBTI Manual (1998). Figures differ between countries, tests and samples, so treat them as rough guides.
What The Four Letters Mean
Each letter is one side of a pair. You can use both sides of every pair; the letter shows which side feels more natural.
| Pair | First letter | Second letter |
|---|---|---|
| Energy | Extraversion: recharged by people and activity | Introversion: recharged by time alone |
| Information | Sensing: trusts facts, details, experience | INtuition: trusts patterns, ideas, possibilities |
| Decisions | Thinking: leads with logic and consistency | Feeling: leads with values and impact on people |
| Lifestyle | Judging: prefers plans and closure | Perceiving: prefers options and flexibility |
The last pair is often misunderstood. “Judging” does not mean judgemental, and “Perceiving” does not mean perceptive. They describe whether you would rather settle things or keep them open.
The Eight Cognitive Functions
Carl Jung’s original theory was not about four letters but about mental functions: two ways of taking in information (Sensing and Intuition) and two ways of deciding (Thinking and Feeling). Each can be directed outward, toward the world (extraverted, marked “e”), or inward, toward the self (introverted, marked “i”). That gives eight functions.
| Function | Short name | What it does |
|---|---|---|
| Extraverted Sensing | Se | Notices and responds to what is happening right now |
| Introverted Sensing | Si | Compares the present with remembered experience |
| Extraverted Intuition | Ne | Sees many possibilities and connections in the outside world |
| Introverted Intuition | Ni | Forms a single inner vision of where things are heading |
| Extraverted Thinking | Te | Organises the outside world for efficiency and results |
| Introverted Thinking | Ti | Builds an inner framework of how things logically fit |
| Extraverted Feeling | Fe | Tunes into group harmony and shared values |
| Introverted Feeling | Fi | Checks choices against a personal set of values |
In the type model that grew out of Jung’s work, each type uses four of these functions in a set order, called the function stack:
- Dominant: the most natural and trusted function.
- Auxiliary: a helper that balances the dominant one.
- Tertiary: less developed, often growing in adulthood.
- Inferior: the least conscious function, which tends to take over under heavy stress.
Each type guide explains its own four functions. The function stack is a theory with little direct research support, but many people find it explains why two types with three shared letters, such as INTJ and INFJ, can feel so different. For how the stack is worked out from the four letters, and why one changed letter can swap every function, see MBTI vs cognitive functions.
How The Types Group Together
| Group | Types | What they share |
|---|---|---|
| Analysts (NT) | INTJ, INTP, ENTJ, ENTP | Competence, logic, ideas |
| Diplomats (NF) | INFJ, INFP, ENFJ, ENFP | Meaning, values, people’s growth |
| Stewards (SJ) | ISTJ, ISFJ, ESTJ, ESFJ | Duty, order, care for others |
| Explorers (SP) | ISTP, ISFP, ESTP, ESFP | Experience, skill, freedom |
These four groups follow the temperament model of psychologist David Keirsey, who linked the types to the classic temperaments in the 1970s and 1980s.
Do Some Types Get Along Better?
You will find many “type compatibility” charts online. Research does not show that any pair of types is destined to succeed or fail. Studies of couples suggest that similar values and emotional stability matter much more than matching letters. What type knowledge can do is help two people understand where friction comes from, for example why a J partner wants the holiday booked months ahead while a P partner would rather decide on the way.
Each type guide includes a section on relationships and on the types it is most often confused with.
How Reliable Is Your Type?
Type questionnaires are popular, but they have known limits. Most people score near the middle on at least one pair, and a borderline letter can flip on a retest. That is why our test shows a percentage for every pair. If one of your letters was close to 50%, read both neighbouring type guides. Academic psychology generally prefers the Big Five model, which measures traits on a scale instead of sorting people into types. You can read more in our test guide.
PrismaTest is not affiliated with the Myers-Briggs Type Indicator or The Myers-Briggs Company. The nicknames used here are our own.
Compare The Types
- Compatibility chart: how all 16 types tend to get along.
- Best careers by type: work environments where each type thrives.
- Fictional characters by type: characters fans associate with each type.
Frequently Asked Questions
What is the rarest personality type?
In the US sample most often quoted, INFJ, ENTJ and INTJ were the rarest, each at around 2% or less. ISFJ, ESFJ and ISTJ were the most common.
What are the 16 personality types based on?
They are based on Carl Jung’s theory of psychological types (1921), which Katharine Cook Briggs and Isabel Briggs Myers developed into a questionnaire in the 1940s.
Can two people with the same type be very different?
Yes. Type describes preferences, not abilities, values or life experience. Two INFPs can differ hugely in confidence, interests and maturity.
Which type is the best?
None. Every type has strengths that suit some situations and blind spots in others.