Hematoxylin and Eosin (H&E) staining is a widely used technique in histology for examining tissue samples under a microscope. Hematoxylin stains cell nuclei blue, highlighting their structure, while eosin stains the cytoplasm and extracellular matrix pink. This contrast allows pathologists to identify different cell types and assess tissue architecture. The H&E staining process involves several steps, including fixation, dehydration, and embedding of the tissue sample. After staining, the slides are examined to diagnose diseases, such as cancer, by evaluating cellular changes and abnormalities. This method is essential for understanding tissue morphology and pathology.