The cell is the structural, functional and biological unit of living organisms. Cell organelles are parts of the cell that execute specific functional roles. Some of the important organelles in the cell are the centrosome, cell membrane, cytoplasm, endoplasmic reticulum, mitochondrion, ribosome, etc. Cell biology is a branch of biology that is concerned with the study of the cell and cell organelles. It focuses on the study of eukaryotic cells, prokaryotic cells and their signaling pathways. Cells can be observed under the microscope using the techniques of optical microscopy, electron microscopy, fluorescence electron microscopy, etc. Cell biology plays a crucial role in varied fields of biology like molecular biology, biochemistry, immunology, genetics, etc. This book is a compilation of chapters that discuss the most vital concepts and emerging trends in the field of cell biology. It aims to shed light on some of the unexplored aspects and the recent researches in this field. It will serve as a valuable source of reference for students as well as experts.