What relates Discourse Analysis (DA) to discourse? The idea is that the former studies the letter. But, the depth of knowledge of the relatedness between the two notions is essential to grasp the nature of both. This paper attempts to review what DA sets out to do in the study of discourse. The ultimate purpose of language use boils down to discourse which is considered the unit of human communication. In discourse, the linguistic and extra-linguistic mechanisms are essentially at play, and as a result of this interplay, it provides some answers to many of our questions on the mystery of meaning in human communication