The term 'isles' can refer to a variety of different landforms. AITS is an acronym for Artificial Islands, which are man-made islands created for various purposes such as tourism or military defense. CAYS are coral islands, which are formed by the accumulation of coral and other materials over time. EYOTS are small islands in a river or lake, often used as a recreational area. All three of these terms refer to different types of islands, each with their own unique characteristics.