 Photodynamic therapy, PDT, is a promising approach to treat cancer using photosensitive drugs and light. However, existing drugs suffer from low water solubility and lack of selectivity, limiting their effectiveness. Recent research has focused on developing new nanoparticles that combine photosensitive drugs with other materials such as gold or titanium dioxide. These particles can be targeted to specific areas of the body, increasing the efficiency of PDT and reducing side effects. This article was authored by Eun Ji Hong, Dae Geon Choi, and Min Suk Shim.