Viruses are submicroscopic parasitic and infectious agents that replicate inside the living cells of other organisms. Virology is the branch of science concerned with the in-depth study of all types of viruses. Viruses are generally studied under an optical microscope. They affect all organisms including bacteria, fungi, plants and animals. Some viral diseases in humans include common cold, influenza, chickenpox, AIDS, etc. Virology has played a significant role in the study of genetics, protein transport and immunology. Some of the diverse topics covered in this book address the varied aspects of virology. Different approaches, evaluations, methodologies and advanced studies on viruses have been included herein. Scientists and students actively engaged in this field will find this book full of crucial and unexplored concepts.