So i accidentally clicked on personality cafe since long time and someone had thanked from this reply i made long time ago there where i explained I/E of functions, so i guess id post it here aswell:
The basics of typology is that there are 4 functions; T, S, N and F, and these functions have both subjective and objective sides to them. Extraversion and introversion of these functions means whether you have trusting attitude towards the subjective or objective side(and opposite orientation has a mistrusting attitude towards it, i.e "it is repressed to the furthest limits" -Jung).
For example an INTP has a trusting attitude towards the subjective side of thinking and mistrusting attitude towards the objective, will not see concrete facts as truth automatically just because they are displayed in the external world, but will evaluate whether that thing makes sense via subjective logic before seeing it as true or false. When it comes to INTJs for example, who have dominant subjective attitude(Ni), but still prefer objective attitude to thinking will more readily accept objective facts as true, but will have mistrusting attitude towards possibilities in the external world(perceived by himself or given by others), unless ofc it makes sense in their subjective world.
Same way an INFJ would more readily accept, notice and process the value systems in the external world(values of others, negative/positive nuances of others speech, values prevalent in the society etc) and how they react to those(mainly how they fit to their big picture understanding and ideas(Ni) and whether or not they make sense to him(Ti)). INFP on the other hand while being capable of seeing value systems in the external world, that kind of processing comes more from empathizing with the external world via Ne and seeing how those things would affect the INFP personally, instead of looking at those things from the objective side of values and internal logic/ideas.