Global colours can be created and applied to different objects in your design. If you want to change the colour across your design at a later time, you can simply edit the global colour in the Swatches section of the Colour panel and all objects update with the new colour automatically and simultaneously.
The global colour could be applied as a solid fill, stroke, or a colour used in a gradient fill; gradients cannot be saved as global colours as they are made up of more than one colour. Global colours can be made while in RGB, CMYK, LAB or Greyscale colour modes.
Global colours are added to the currently selected document palette in the Swatches section of the Colour panel. If a document palette does not exist when your document's first global colour is created, a new document palette is automatically created for you in which the colour will be stored. Once created, you can apply the global colour to your design.
To create a global colour from scratch:All objects using the global colour will be updated automatically.