APNGs, or Animated Portable Network Graphics, are a type of image file format that allows for animated images. They are an extension of the standard PNG format, which is widely used for static images. APNGs support multiple frames, enabling smooth transitions and animations while maintaining high-quality graphics. Unlike other animation formats like GIF, APNGs can display a wider range of colors and offer better compression. This makes them ideal for web use, as they can provide visually appealing animations without significantly increasing file size. APNGs are supported by several modern web browsers, enhancing their usability online.