A colour management system is a software-based calibration and profiling tool that ensures consistent and accurate colour reproduction across all digital imaging devices, from cameras and scanners to monitors and printers. By standardizing how colours are interpreted and displayed, a CMS helps photographers and designers ensure that the colours they see on screen match the final printed output. Proper colour management is essential for professional photography, graphic design, and printing workflows, reducing colour discrepancies, maintaining visual consistency, and delivering reliable, true-to-life images.