Carcinomas are a type of cancer that begins in the epithelial cells, which line the surfaces of organs and tissues in the body. These cells can be found in places like the skin, lungs, and digestive system. Carcinomas are the most common form of cancer and can spread to other parts of the body if not treated early. There are several subtypes of carcinomas, including adenocarcinoma, which originates in glandular tissues, and squamous cell carcinoma, which arises from flat cells. Early detection and treatment are crucial for improving outcomes, making regular check-ups and awareness of symptoms important for everyone.