Hematoxylin and Eosin (H&E) is a widely used staining technique in histology, the study of tissues. Hematoxylin stains cell nuclei blue, highlighting their structure, while eosin stains the cytoplasm and extracellular matrix pink. This contrast allows pathologists to examine tissue samples under a microscope, aiding in the diagnosis of diseases. The H&E stain is essential for identifying various cellular components and abnormalities. It is commonly used in cancer research and diagnosis, as it helps differentiate between normal and abnormal tissue. The technique is simple, cost-effective, and provides clear visual results, making it a standard in medical laboratories.