A "fisheye" is a type of wide-angle lens that creates a distinctive visual effect by capturing a very wide field of view, often up to 180 degrees or more. This lens distorts the image, making straight lines appear curved, which gives a unique, spherical perspective. Fisheye lenses are commonly used in photography, especially in landscape photography and action sports, to create dramatic and immersive images. In addition to photography, fisheye lenses are also used in video production and virtual reality applications. They help create a sense of depth and space, making viewers feel as if they are part of the scene. The unique distortion can also be used creatively in artistic photography to produce striking visual effects.