In the past 15 years, breakthroughs in the understanding towards the pathogenesis of psoriasis have been translated into highly and targeted effective therapies which provides fundamental insights into the pathogenesis of chronic inflammatory diseases. In this article we understand the mechanisms involved in the initiation and development of psoriasis, as well as the therapeutic options that arises from the dissection of the inflammatory psoriatic pathways. The whole discussion begins by addressing the inflammatory pathways and key cell types which initiating and perpetuating the psoriatic inflammation. Also, we discuss the role of genetics, associated epigenetic mechanisms, and the interaction of the skin flora in the pathophysiology of psoriasis. So, we the purpose of our study is to understand psoriasis comprehensively, and this review is well-established to explain the therapies, and other novel targeted drugs that are mostly used in the effective treatment of psoriasis.