Histochemistry and cytochemistry are related fields of study in pathology that deal with the identification and localization of specific chemical components (such as enzymes, proteins, and carbohydrates) within cells (cytochemistry) and tissues (histochemistry). Histocytochemistry can be defined as the application of histochemical techniques to the study of cellular components. These techniques often involve the use of stains or dyes that react with specific molecules, allowing for their visualization under a microscope. This information can be useful in understanding the function and behavior of different cells and tissues in health and disease.