Biological staining is a technique used in microscopy to enhance the contrast of biological tissues and cells. By applying specific dyes or stains, scientists can visualize structures that are otherwise difficult to see under a microscope. Common stains include Hematoxylin and Eosin, which are often used in histology to differentiate between various cell types and tissue components. These stains work by binding to specific cellular components, such as proteins or nucleic acids, allowing for detailed examination. Biological staining is essential in fields like pathology and cell biology, as it aids in diagnosing diseases and understanding cellular functions.