The branch of biology which deals with the study of the function and structure of the cell is referred to as cell biology. It focuses on the physiological attributes, metabolic processes and life cycle of the cell. It also studies the signaling pathways, chemical composition and interactions of the cell with their environment. It encompasses both prokaryotic and eukaryotic cells. Research in this field is conducted on both microscopic and molecular levels. The knowledge of the components of cells as well as their functioning plays a vital role in the studies related to different bio-medical fields. This textbook is a valuable compilation of topics, ranging from the basic to the most complex theories and principles in the field of cell biology. Some of the diverse topics covered herein address the varied branches that fall under this category. This book will provide comprehensive knowledge to the readers.