Squamous cells are flat, scale-like cells found in various tissues throughout the body, including the skin, lungs, and lining of the mouth. They play a crucial role in protecting underlying tissues from damage and infection. These cells are part of the epithelial tissue, which serves as a barrier and helps in absorption and secretion. When squamous cells become abnormal, they can lead to conditions such as squamous cell carcinoma, a type of skin cancer. This cancer typically arises from prolonged exposure to ultraviolet (UV) radiation or other irritants. Early detection and treatment are essential for better outcomes.