AW wrote:
what is the MBTI test, sorry if this sounds ignorant?

MBTI = Myers-Briggs Temperament Indicator
It was recently announced that Myers & Briggs are mother & daughter. They had to hide that in order to be published.
They based their work on the work of Carl Jung, who emphasized that no one can be defined, but that communication about personalities would be easier.
These are spectrums (spectra?) -
Introvert-Extravert
iNtuitive-Sensate
Feeling (in the sense of Values)-Thinking
Perceptive-Judgement (today we would say Decisive)
For example, I am INFP
introvert, intuitive, feeling, perceptive.