In Plesk, a skin is a set of CSS and image files. CSS files define the style of Plesk interface elements; image files are Plesk interface icons, logotype images and other pictures, used in CSS files. All these files, placed in corresponding sub-directories, compose the structure of the skin directory.
Skins are an easy and flexible way to diversify your Plesk user interface appearance. Using skins you can change the colors of the interface elements, set new fonts properties, use different images for icons in the interface, etc.
It takes only a few clicks to replace one skin with another. Different skins can be used by different users on one server.