CMYK stands for Cyan, Magenta, Yellow, and Key (Black). It is a subtractive color model in which a color is created by subtracting (absorbing) certain wavelengths of light and reflecting others. The CMYK color model is used in printing to produce a full range of colors by combining the primary colors of ink: cyan, magenta, and yellow, along with black.
One key difference between RGB and CMYK is that RGB has a wider gamut (range of colors) than CMYK. This means that RGB is capable of displaying more colors than CMYK, which can lead to more vibrant and saturated images. However, because RGB is an additive color model and CMYK is subtractive, how colors are produced is different. RGB colors are created by adding light, while CMYK colors are created by subtracting it.
Another difference between RGB and CMYK is that RGB is used for digital media, while CMYK is used for printing. When designing for print, it is important to convert RGB colors to CMYK to ensure that the colors will print accurately. This is because the RGB color space is wider than the CMYK color space, so some RGB colors may not be reproducible using CMYK inks.