Cell biology, also known as cytology, is a biology branch focused on studying cells' structure, function, and behavior, recognizing them as life's fundamental units. It explores both prokaryotic and eukaryotic cells, delving into topics like cell metabolism, communication, cycle, biochemistry, and composition. Utilizing microscopy, cell culture, and fractionation techniques, researchers uncover insights into cellular functions, crucial for understanding organisms. This knowledge proves fundamental across biological sciences and is integral to biomedical research, particularly in fields like cancer and genetics, where cell biology intersects with molecular biology, medical microbiology, immunology, and cytochemistry.