Photodynamic therapy is a medical treatment that uses a combination of light and photosensitizing agents to destroy cancer cells. There are several synonyms for photodynamic therapy, including photochemotherapy, light therapy, phototherapy, and phototoxic therapy. Photodynamic therapy can be used to treat a variety of cancers, including skin, brain, and lung cancer, and has been shown to be effective in treating precancerous lesions and some noncancerous skin conditions. The treatment is often used in conjunction with other cancer treatments such as surgery, chemotherapy, and radiation therapy to help improve outcomes and reduce the risk of cancer recurrence.