Manipulation of matter at the nanoscale level is the key factor in nanotechnology, and it is considered as a great driving force behind the current industrial revolution since it offers facile and feasible remedies for many problems. Because of the unique characteristic properties of nanomaterials, they can be employed in a wide variety of fields such as agriculture and food technology, catalysis, biomedical applications, tissue culture engineering, and fertilizers. In this regard, characterization of nanomaterials plays a significant role in determining their optical, thermal, and physicochemical properties. Many techniques have been used in nanomaterial characterization, and the most important techniques are discussed in detail in this book with their principles, basic operation procedures, and applications with suitable examples. In summary, this book offers broad content on the most important chemical and structural characterization techniques of nanomaterials.