Malignant neoplasms, commonly known as cancer, are a group of diseases characterized by the uncontrolled growth of abnormal cells in the body. These cells can invade nearby tissues and spread to other parts of the body through the bloodstream or lymphatic system. This process is known as metastasis, and it can lead to serious health complications. There are many types of malignant neoplasms, including carcinomas, which originate in epithelial cells, and sarcomas, which arise from connective tissues. Risk factors for developing cancer include genetics, environmental exposures, and lifestyle choices. Early detection and treatment are crucial for improving outcomes in individuals diagnosed with malignant neoplasms.