Prahasana and the Vithi are two of the major playforms in Sanskrit Drama. Though studies on some individual prahasanas and vithis have appeared from time to time in research journals, there is no comprehensive study of the two playforms on comparative basis, undertaken so far. The present book is an attempt to cover all aspects of prahasana and vithi, in theory and practice. It is based on an in-depth study of manuscripts, microfilms and transcripts collected from various sources. Beginning with the important aspects of Sanskrit drama, the book briefly examines the theories of rasa realization and presents a detailed account of the hasya rasa besides undertaking a study of the theoretical aspects of the prahasana first and the vithi in a later chapter, as sanctioned in the works on dramaturgy. It also presents an account of the suddha prahasanas that provide a contrasting picture in comparison with the samkirna variety. The work also analyses a few important vithi specimens. The chapter on the Vithyangas is a special feature of the work. Illustrations from well-known dramas serve to explain the textual matter with a rare clarity of thought and expressions. This volume will interest scholars and students of Indology who are focused on the study of Sanskrit drama and dramaturgy, in particular, and literature, in general. It will also benefit readers interested in ancient Indian theatre.