From within the Color database, you can export single colors or color groups. Color are saved as .elc files, while groups or entire categories are saved as folders containing the individual .elc files. Exporting can be done using the import/export function from the context menu or from the Actions drop-down menu in the Color Picker.
You can also import colors or color groups / libraries. You can import
a Comma Separated Value list
an Adobe Photoshop Swatch file
an Adobe Color Table
an Adobe Swatch Exchange file
A color group: a folder containing .elc files as exported earlier
Importing can be done using the import/export function from the context menu or from the Actions drop-down menu in the Color Picker