The Myers Briggs Type Indicator was developed by Isabella and Katherine Myers Briggs. It was based on Carl Jung's study on Cognitive Functions and his discoveries on Introverted, Extroverted, iNtuitive, Sensory, Feeling and Thinking people. They also added a new dichotomy, Judging and Perceiving, loosely, but not completely, based on his studies on Rational and Irrational people.
The MBTI was used to map out and help people find their dream job. The MBTI asks who you would like to be, and what you would like to do for a living, and helps you understand your interests, hobbies, passions, and values. It can be used to give you an idea of your dream job or dream life. It was helpful during the second world war, when many had to get new jobs or adjust to a changing workforce.
Sometimes referred to as the 16 Personalities, it is different from the Big 5 in that your values or dream self is not always the same as your current life or behaviour. You can want to be another personality type than what you are currently like. While you may have developed to be the responsible person in your family, you might enjoy a more easygoing, free and creative job. I have found that you can use the MBTI to understand your values and who you are in a healthy state of flow.