PNG - Portable Network Graphics: is used to improve and replace GIF images as an image-file format. It supports palette-based, greyscale, greyscale with alpha, RGB, or RGBA images. PNG was designed to import images onto the internet.
JPEG - Joint Photographic Experts Group: is a commonly used method of lossy compression for photographic images.
Lossy - Original image information that has been lost cannot be restored
GIF - Graphics Interchange Format: is a bitmap image format. It supports up to 8 bits per pixel, and this allows a single image to reference a palette of up to 256 distinct colors.
Depending of what kind of image you wanted, all these formats would be good for all of them. If you wanted an animated image, you would use the GIF format.
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