1. offset lithography
2. digital printing
3. screen printing
CMYK is used to define colour as it when created during the printing process. Sometimes referred to as process colour.
We need to think of colour as ink.
Global Colours - A global colour is automatically updated throughout your artwork when you edit it. All spot colours are global; however process colours can be either global or local. you can identify global colour swatches by the global colour icon (when the panel is in list view) or a ∆ in the lower corner (when the panel is in thumbnail view)
Spot Colours - A spot colour is an ink that is used instead of, or in addition to CMYK process inks. You can identify colour swatches by the spot colour icon (when the panel is in list view) or a dot in the lower corner (when the panel is in thumbnail view)
Process Colours - A process colour is printed using a combination of the four process inks CMYK. By default illustrator creates new swatches as process colours.
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