Defense against factions refers to the mechanisms and strategies employed to mitigate the influence and impact of interest groups or political factions that may threaten the stability of a government or the rights of individuals. This concept is crucial in understanding how a well-structured government can control the negative effects of factions, ensuring that no single group can dominate or oppress others. The protection against factions also highlights the importance of a representative democracy, where diverse interests can be balanced through effective governance.