Описание тега skins
A skin is a custom graphical appearance achieved by the use of a graphical user interface (GUI) that can be applied to specific software and websites to suit the purpose, topic, or tastes of different users.
A skin (also known as visual styles in Windows XP) is a custom graphical appearance achieved by the use of a graphical user interface (GUI) that can be applied to specific software and websites to suit the purpose, topic, or tastes of different users. A skin may be associated with themes. Software that is capable of having a skin applied is referred to as being skinnable, and the process of writing or applying such a skin is known as skinning.