Cancer cells are abnormal cells that grow and divide uncontrollably, unlike normal cells that follow a regulated life cycle. They can form tumors, which are masses of tissue that can invade nearby organs and disrupt their function. Cancer cells can also spread to other parts of the body through the bloodstream or lymphatic system, a process known as metastasis. These cells often have mutations in their DNA, which can result from various factors, including genetic predisposition, environmental influences, and lifestyle choices. Because of their uncontrolled growth, cancer cells can lead to serious health issues, making early detection and treatment crucial for improving outcomes.