Theoretical linguistics
Theoretical linguistics, or general linguistics, is the branch of linguistics which inquires into the nature of language itself and seeks to answer fundamental questions as to what language is; how it works; how universal grammar (UG) as a domain-specific mental organ operates, if it exists at all; what its unique properties are; how language relates to other cognitive processes, etc. Theoretical linguists are most concerned with constructing models of linguistic knowledge and ultimately developing a linguistic theory.