JPEG (Joint Photographic Experts Group) is a popular image file format used for storing and compressing digital images. It is a lossy compression method, meaning that some image quality is sacrificed in order to reduce the file size. This makes it ideal for sharing and displaying images on the internet, as it allows for faster loading times without significantly compromising the visual appearance of the image. The JPEG format is widely supported by most devices and software, making it a versatile and convenient choice for storing and sharing photos and other visual content.