Textbook in PDF format This book highlights the overview of deep eutectic solvents (DESs), their physical and chemical properties for both hydrophilic and hydrophobic types. The multipurpose use of DES in extraction, treatment processes of obtaining value-added products such as organic polymer, biodiesel, active compound or protein from various sources such as biomass, plastics, plant, and animals are discussed. Additionally, this book also includes the impact of its usage on the environment and socio-economic challenges in high scale consumption in various applications as well as its recyclable capability. This book could be a reference for scholars or professionals and students who are involved in this field. The Discovery and Development of Deep Eutectic Solvents (DESs) Dissolution of Plastics Using DESs Green Solvent-Based Approaches for Recycling Spent Lithium Batteries Deep Eutectic Solvents in Biotransformation Processes Extraction of Active Compounds from Plants and Animals Using Deep Eutectic Solvents (DESs) Extraction of Protein from Plant Materials Using Deep Eutectic Solvents Pretreatment of Lignocellulosic Biomass Using Deep Eutectic Solvents Deep Eutectic Solvent (DES) and Ionic Liquid (IL) in Biodiesel Production Challenges, Toxicity and Socioeconomic and Environmental Impact Using Des