This book makes an attempt to unravel the complexity of the concept of Modernism, exploring its numerous definitions, cultural factors, scope, nature, period, locale and major characteristics. Divided into 7 chapters, the book mainly pivots on the omnipresent effect of modernism in English poetry through a welter of overlapping artistic, visual and architectural movements imbued with the spirit of changed sensibility in the early decades of the twentieth century. The worth-mentioning avant-grade-isms included herein are- dadaism, cubism, futurism, surrealism and expressionism. The study also elucidates the concept of history, myth, and existentialism imbibed by the modernist literary texts lending as aesthetic beauty. In the end, the book dwells upon the most fashionable term, Post modernism, in the academic world. With its definitions, extent, dimensions and cultural theories, the main postmodernist literary characteristics also occupy a due place. Shorn of all literary pretensions, the book primarily lays bare the recurring problems related to the understanding of Modernism and Postmodernism to the Indian scholars.