This edited volume is enriched with 27 lead articles contributed by the authorities in their respective fields and appears to fill up the vacant niche towards better understanding of this habitat both in theory and practice and thus meant to serve as a resource material for both undergraduate and post-graduate students, researchers, academicians, ecologist and environmentalists, nature lovers as well as common people by large. The present compilation provides diversified information ranging from microscopic zooplankton to charismatic mega fauna including macrophytes, aberrant groups, aquatic insects, molluscs, migratory and resident birds, mammals associated with wetland habitats. Special emphasis on their potentiality as ecosystem service providers are worth for the reader to extend the concepts and reality of wetland sustenance. At the same time it also discusses the problems and crises in and around functioning of this unique ecosystem in greater details and suggests conservation measures.