This document provides an overview of cancer including what it is, common types, causes, effects, treatments, and ways to prevent it. Cancer is defined as uncontrolled growth of abnormal cells that can affect different parts of the body. Common types include bone, breast, lung and skin cancers. Causes include genetic factors, unhealthy foods, tobacco, radiation, and sun exposure. Treatments include surgery, radiation, chemotherapy, and biologic therapies. Prevention strategies incorporate eating healthy, exercising, avoiding tobacco, and protecting from sun exposure.