YOU WILL OBEY
Paraphrasing from Wikipedia, the definition of Femdom is this:
Femdom: Female dominance (or femdom) refers to BDSM relationships and BDSM scenes in which the dominant partner is female. A dominant woman, she may be called a Domme, Femdomme, Domina, or Dominatrix, depending on context or personal preference. A female dominant in a master/slave relationship is often termed a Mistress, not to be confused with the colloquial usage of mistress as a kept sexual partner without a similarly formalized power relationship. (Just in case you had any confusion or stopped by this site by mistake...but I seriously doubt that.)
But if you are under 18 years of age, are offended at all by such material, or if it is illegal to view adult material in your community do not enter site.