Cell biology, also known as cytology, is a branch of biology that studies the structure, function, and behavior of cells. Cells are the fundamental units of life, responsible for the survival and function of organisms, and all living beings are composed of cells. Cell biology encompasses both prokaryotic and eukaryotic cells and includes various subfields, such as cell metabolism, cell signaling, the cell cycle, biochemistry, and cell composition. Cell research utilizes diverse techniques, including microscopy, cell culture, and cell fractionation, allowing for a deeper understanding of complex biological systems. Understanding cell components and their functions forms the foundation of all biological sciences and is crucial for biomedical research, particularly in studying cancer and other diseases. Additionally, cell biology is closely linked to other scientific fields, such as genetics, molecular genetics, molecular biology, medical microbiology, immunology, and cytochemistry.