<span>CMYK means cyan, magenta, yellow, and key (black). They are the four color model used in color printing or printing color images. It lets you subtract the colors on the image. CMYK partially or fully masks colors on a lighter view. </span>
A NAS device facilitates file sharing and data backup.
NAS stands for "Network Attached Storage". It a device design specially to store and manage files and within a network. It provides centralized data access and storage.
NAS is somehow considered as a specialized external hard drive.