Gif
Gif is usually a larger less pixelated file, this one takes 2 seconds to download. (41.37K)
Jpeg
A smaller file which has more visible andlarger pixels, an estimated 2 second download (8.417K)
Png-8
A Png-8 file is higher resolution the jpeg though a smaller file than a Gif and takes about 7 seconds to download. (31.55K)
Png-24
A Png-24 file Is the highest resolution of these 4, It takes about 14 seconds to download with small and smooth pixels. (72.36K)