What does pragmatics study? how does it differ from semantics?

Pragmatics studies how meaning is conveyed in the process of communication|It is a comparatively new branch of study in the area of linguistics|it is a sentence of “what do you mean by X”|That is| the speaker of this utterance is actually asking for his/her partner’s intention|or what the partner intends the utterance to mean by X|or rather, the speaker is using this utterance as a denial of or protest against what the partner has asserted implicitly|Thus