Cell biology is that branch of biology which studies the organization, structure, physiological properties, life cycle, metabolic processes, signaling pathways of cells and their interaction with the environment. It overlaps with developmental biology, immunology, biochemistry, etc. This book attempts to understand the multiple branches that fall under the discipline of cell biology and how such concepts have practical applications. Such selected concepts that redefine the subject have been presented in the book. For all those who are interested in the subject, this text can prove to be an essential guide.