Phototunable is a term that refers to the ability of a material to change its properties in response to light. There are several synonyms for this word, including photoresponsive, photochromic, photosensitive, and photoswitchable. These terms are often used interchangeably in scientific literature and describe materials that can be modified by exposure to different wavelengths of light. Examples of phototunable materials include photochromic sunglasses, which darken in bright sunlight, and photosensitive polymers, which can be used to create patterns on surfaces using light. Understanding the properties of phototunable materials is important for the development of advanced technologies, such as optoelectronics and smart materials.