This book presents the development of electrospun materials, fundamental principles of electrospinning process, controlling parameters, electrospinning strategies, and electrospun nanofibrous structures with specific properties for applications in tissue engineering and regenerative medicine, textile, water treatment, sensor, and energy fields. This book can broadly be divided into three parts: the first comprises basic principles of electrospinning process, general requirements of electrospun materials and advancement in electrospinning technology, the second part describes the applications of electrospun materials in different fields and future prospects, while the third part describes applications that can be used in advanced manufacturing based on conjoining electrospinning and 3D printing. Electrospinning is the most successful process for producing functional nanofibers and nanofibrous membranes with superior chemical and physical properties. The unique properties of electrospun materials including high surface to volume ratio, flexibility, high mechanical strength, high porosity, and adjustable nanofiber and pore size distribution make them potential candidates in a wide range of applications in biomedical and engineering areas. Electrospinning is becoming more efficient and more specialized in order to produce particular fiber types with tunable diameter and morphology, tunable characteristics, having specific patterns and 3D structures. With a strong focus on fundamental materials science and engineering, this book provides systematic and comprehensive coverage of the recent developments and novel perspectives of electrospun materials. This comprehensive book includes chapters that discuss the latest and emerging applications of nanofiber technology in various fields, specifically in areas such as wearable textile, biomedical applications, energy generation and storage, water treatment and environmental remediation, and sensors such as biomarkers in healthcare and biomedical engineering. Despite all these advancements, there are still challenges to be addressed and overcome for nanofiber technology to move towards maturation.