Emerging viral infections continue to pose significant threats to global public health, economic stability, and healthcare systems. Increased globalization, urbanization, climate change, environmental degradation, and human-animal interactions have accelerated the emergence and spread of novel viral pathogens. Recent outbreaks, including severe acute respiratory syndrome (SARS), Middle East respiratory syndrome (MERS), Ebola virus disease, Zika virus infection, and COVID-19, have demonstrated the vulnerability of nations to infectious disease emergencies. This study reviews the epidemiology of emerging viral infections, factors contributing to viral emergence, surveillance systems, public health preparedness frameworks, and global response strategies. Through a comprehensive review of scientific literature, international health policies, and pandemic preparedness initiatives, the study highlights lessons learned from previous outbreaks and identifies critical areas for improvement. Findings suggest that strengthening surveillance, enhancing laboratory capacity, promoting international collaboration, investing in vaccine development, and adopting One Health approaches are essential for future preparedness. The study concludes that global resilience against emerging viral threats requires coordinated, multidisciplinary, and sustainable public health strategies.