Oncology encompasses the study, diagnosis, and treatment of cancer. An oncologist, often referred to as a cancer specialist, is a medical doctor specializing in providing comprehensive medical care to individuals diagnosed with cancer.
Chemotherapy, often referred to simply as "chemo," is a medical treatment that uses powerful drugs to target and destroy fast-growing cells in the body. It is commonly used in the treatment of cancer because cancer cells tend to grow and multiply at a much faster rate than normal cells.