A tumor is an abnormal growth of cells in the body. These cells can multiply uncontrollably, forming a lump or mass. Tumors can be classified as benign, which are non-cancerous and usually do not spread, or malignant, which are cancerous and can invade nearby tissues and organs. The causes of tumors can vary, including genetic factors, exposure to certain chemicals, or lifestyle choices. Early detection and treatment are crucial for managing malignant tumors, often involving methods like surgery, radiation, or chemotherapy. Understanding tumors is essential for improving health outcomes and advancing research in cancer treatment.