The Moderna COVID-19 Vaccine is an mRNA vaccine designed to protect against the SARS-CoV-2 virus, which causes COVID-19. It works by using a small piece of the virus's genetic material to instruct cells in the body to produce a harmless spike protein. This triggers an immune response, helping the body recognize and fight the virus if exposed in the future. Approved for emergency use in many countries, the Moderna vaccine has shown high efficacy in preventing severe illness and hospitalization due to COVID-19. It is typically administered in two doses, with the second dose given a few weeks after the first.