This course introduces major sub-fields in macro-linguistics. These are sociolinguistics, psycholinguistics, applied linguistics, and ELT. It identifies and defines concepts related to these disciplines. Additionally, it traces the emergence of each one of these sub-fields of linguistics, displays their objectives, and elucidates the methods adopted by them. To make the course practical, implications and consequences of the theories inherent to these domains will be discussed. The ultimate objective of this course is to enable students acquire competence in linguistics that goes beyond the theoretical description of language and its relevant internal components.