RGB Jpegs can be used if the logo is going to be used on screen. Download RGB Jpeg.
CMYK Jpegs should be used if the logos is going to be printed. Download CMYK Jpeg.
CMYK Eps are used if you are having artwork professionally designed or if the logo needs to be used at a large size. You will be unable to open eps files unless you have specialist image editing or design software. Download CMYK Eps.