Most people who don’t work proffesionally with images use the RGB colour space which is used on monitors and displays, but when you want to print a brochure for example your printer will expect it in the CMYK colour space. Or vice versa you received a proffesional drawing in cmyk and it needs to be converted for use on a computer display
With the free online tools below you can convert your images from RGB to CMYK color space using a professional ICC profile. or from CMYK to RGB