Atezolizumab is a type of immunotherapy medication used to treat certain cancers, including non-small cell lung cancer and bladder cancer. It works by blocking a protein called PD-L1, which helps cancer cells evade the immune system. By inhibiting this protein, Atezolizumab allows the immune system to recognize and attack cancer cells more effectively. This medication is administered through an intravenous infusion and is typically given in a healthcare setting. Atezolizumab is part of a class of drugs known as checkpoint inhibitors, which have revolutionized cancer treatment by enhancing the body's natural immune response against tumors.