In his recent article Paring down webfonts in FF Subsetter, David Sudweeks mentions WOFF. No, this is not the bark of an adorable puppy, but the abbreviation for Web Open Font Format. Developed by Mozilla® in concert with Type Supply, LettError, and other organizations, it uses a compressed version of the same table-based SFNT structure used by TrueType, OpenType, and Open Font Format, but adds metadata and private-use data structures, including predefined fields allowing foundries and vendors to provide license information if desired. Sounds as complicated to you as it did to me? I will to try to explain what this all means.