This book, Nanomaterials: Fundamentals, Synthesis, and Applications, offers an in-depth exploration of nanomaterials, covering their properties, synthesis methods, applications, and associated challenges. It begins by providing a foundational understanding of nanomaterials, including their historical development and unique characteristics, before progressing into more advanced topics such as their role in electronics, energy, and biomedical fields. The book introduces nanomaterials by defining and classifying them, giving an overview of their development over time and the main types available today. In some chapters the book includes into the synthesis and characterization of nanomaterials, respectively, presenting key methods used to create and analyze nanomaterials at the atomic level. These chapters highlight both traditional techniques and recent advances, giving readers an up-to-date understanding of current practices in nanotechnology. In subsequent chapters, the book examines the role of nanomaterials in various applications: electronics, energy, environment, and biomedicine .Each of these chapters highlights how nanomaterials are being used to innovate in these sectors and what future advancements may arise. Finally, the book addresses important considerations surrounding safety, ethics, and societal impact before concluding with a discussion of future trends and challenges. This text is an essential resource for anyone interested in the cutting-edge world of nanomaterials and their potential to transform the future.