Graphics file format for computer icons. It could be used as favicon for website too.
ICO (Icon) is a raster image file format that is commonly used to store icons, small graphics, and logos. It was introduced in the late 1980s and has since become one of the most popular image file formats for Windows operating systems. The ICO file format stores images as a set of pixels arranged in a square or rectangular shape, with each pixel representing a single color value. The size of an ICO image is determined by the number of pixels it contains, and the file can be compressed to reduce its size. One of the main advantages of ICO files is their versatility. They can be used for a wide range of applications, from displaying icons on a computer desktop to creating small graphics and logos. Because they are so small in size, ICO files can be easily transferred or stored on a variety of devices, including flash drives and cloud storage services.