Photodynamic therapy (PDT) is a type of cancer treatment that uses a combination of light and a photosensitizing agent to kill cancer cells. The photosensitizing agent is injected into the patient's bloodstream and is absorbed by the cancer cells. When specific wavelengths of light are applied to the area where the cancer is located, the photosensitizing agent becomes activated and produces a form of oxygen that kills the cancer cells. PDT is considered a minimally invasive treatment option and is commonly used to treat skin cancer, certain types of lung cancer, and cancers of the esophagus and bladder. It has also been used to treat certain non-cancerous conditions such as age-related macular degeneration and actinic keratoses. Overall, PDT is a promising treatment option that may offer a less toxic alternative to traditional cancer treatments such as surgery, chemotherapy, and radiation therapy. Research in this area continues to explore new applications and improved techniques to enhance the effectiveness of PDT.