Vaccines are medications that shield patients from a variety of infections that can be very harmful, and even fatal. A vaccine is a chemical agent that is intended to protect humans against bacterial and viral infections. Vaccines, also known as immunizations, take advantage of the innate immune system's capacity to combat viral infection. When an individual is resistant to an illness, vaccines ensures that they are safe from it. The majority of Vaccines are administered by injection, but others are administered orally or nasally. Vaccination is a quick, reliable, and efficient method of shielding people from dangerous viruses as they spread.