These features are based on the attitude to the perception of information: object and subject. For extroverts, I am one of the objects of this world; for introverts, I am the subject around which the world is built.
Quite often, these signs are confused with such qualities as sociability - unsociability. However, sociability is essentially a contact, the ability to easily and quickly converge with people. These qualities are largely determined by the attributes of logic-ethics. On average, ethicists are more sociable than logicians.
An unsociable extrovert tends to observe the world from the outside, noticing everything that happens, but not coming into contact with people. A sociable introvert may have intense contact with people, either because they are included in his subjective world, or because he needs information that is directly relevant to his subjective world.