Cytology (from Greek κύτος, kytos, "a hollow"; and -λογία, -logia) is the study of cells. Cytology is that branch of life science that deals with the study of cells in terms of structure, function and chemistry. Robert Hooke is sometimes seen as the father of cytology.Based on usage it can refer to: Cytopathology: the study of cellular disease and the use of cellular changes for the diagnosis of disease.Cell biology: the study of (normal) cellular anatomy, function and chemistry.