3. DIFFERENT FIELDS DEPENDING ON THE EXTERNAL FACTORS CONSIDERED:

CONTEXTUAL LINGUISTICS: The study of Linguistics in interaction with other academic disciplines, how language interacts with the rest of the world.

APPLIED LINGUISTICS: It is the study of language related issues applied in everyday life. It often refers to the use of linguistic research in language teaching.

DIACHRONIC LINGUISTICS: Examines how language changes through time, sometimes over centuries.

An importamt part of linguistic investigation is into the nature of the differences among the languages of the world. The nature of variation is very important to understand human linguistic ability. If this ability is constrained by biological properties, then languages must be very similar.If it is uncostrained languages might vary a lot.