The scientific study of languages is termed as linguistics. Theoretical linguistics is the branch of linguistics that deals with the study of the nature of languages. It focuses on studying the properties of language. The central concern of this study is the characterization of the nature of human language ability and competence. Based on the theories of language, the field uses various frameworks for linguistic inquiry to understand similar terms in different ways. Some of the areas of specialization within this field are phonetics, morphology and pragmatics. This book elucidates the concepts and innovative models around prospective developments with respect to the field of theoretical linguistics. It includes some of the vital pieces of work being conducted across the world, on various topics related to this discipline. The book aims to equip students and experts with advanced topics and upcoming concepts in this area.