Biodefense refers to the strategies and measures taken to protect against biological threats, such as infectious diseases or bioterrorism. This field involves the development of vaccines, treatments, and diagnostic tools to respond to biological agents that could harm public health. Governments and organizations work together to enhance public health systems, improve surveillance for outbreaks, and ensure rapid response capabilities. Biodefense also includes research on potential biological threats and the creation of policies to mitigate risks associated with biological weapons and natural pandemics.