This book illustrates advancements in the sophisticated tools and techniques for discovering and designing new antiviral drugs, identifying approved drugs against new and emerging viruses through large-scale computational virtual screening or drug repurposing approaches, and their evaluation in various in vitro and in vivo models. The chapters also cover the challenges associated with the emergence of antiviral drug resistance and possible ways to counter them. It discusses bioinformatics tools and software and computational approaches for the discovery of antivirals. The books also outline approaches for designing broad-spectrum antivirals effective against viruses by epigenetic- and epitranscriptomic-targeted reprogramming. Further, it provides vital details on the procedures for drug applications, clinical trials, and their regulations. Finally, the book provides a comprehensive yet representative description of advances in antiviral research protocols and methodologies suitable for antiviral researchers at all career stages, including graduate and postgraduate students and policy-makers.