# Skin options The skin configuration options control report behavior, including: * how files and plots are generated * how files and plots look * how data are displayed * how units are displayed * which language is used Options that control the behavior of a skin are specified in the skin configuration file `skin.conf`. Language-dependent labels and texts are specified in the language files, located in the skin's `lang` directory. UTF-8 is used throughout the skin configuration file, just as it is throughout the WeeWX configuration file.