P R A G M A T I C S

Pragmatics is the study of aspects of meaning and use of language that depend on the speaker, receiver, and speech context.The term pragmatics was coined in the 1930s by psychologist and philosopher Charles Morris. Pragmatics was developed as a subfield of linguistics in the 1970s.
        

         In a sense, pragmatics is seen as an understanding between people to obey certain rules of interaction. In everyday language, the meanings of words and phrases are constantly implied and not explicitly stated. In certain situations, words can have a certain meaning. You might think that words always have a specifically defined meaning, but that is not always the case. Pragmatics studies how words can be interpreted in different ways based on the situation. 

Example 

1."My dog chased a cat under the house."

  Because contains the pronoun my,part of its meaning depends on the fact that you uttered it.

2."John likes that blue car.He buys it."

  the context to determine what he is reffering to in "that blue car", "he" , "it"