Tumor growth refers to the increase in the number of cells in a specific area of the body, leading to the formation of a mass called a tumor. Tumors can be classified as benign, which are non-cancerous and do not spread, or malignant, which are cancerous and can invade nearby tissues and organs. The process of tumor growth involves cell division, where abnormal cells multiply uncontrollably. Factors such as genetic mutations, environmental influences, and lifestyle choices can contribute to the development of tumors. Understanding tumor growth is essential for developing effective treatments for conditions like cancer.