A battle droid is a class of military robot used as an easily controlled alternative to human soldiers, most notably seen in the "Star Wars" prequel trilogy of films and the "" TV series, in which 'B1' and 'B2' models are frequent antagonists. Due to their ubiquity, the terms 'B1' and 'battle droid' are used interchangeably; 'B2' models are also referred to as 'super' battle droids. These droids are mainly used as the primary troops of the Confederacy of Independent Systems or Separatist Alliance, acting as the counterpart to the clone troopers of the Galactic Republic during the Clone Wars.