Viruses are tiny infectious agents that can only multiply inside living cells. They can infect all kinds of organisms and play a role in genetic diversity. COVID-19, caused by the SARS-CoV-2 virus, is a serious disease that emerged as humans grew in numbers. Coronaviruses, a group of viruses, can cause mild to severe respiratory infections in humans and other animals. The SARS-CoV-2 virus is an RNA virus, which is particularly harsh. Scientists have studied the history of viruses and estimated the impact of COVID-19. They have looked into possible treatments and prevention methods. The article suggests that 16% of the world's population may be affected by the virus.