Sir, a vaxine shot injects you with a dead version of the virus. Then your body goes to work, learning how to fight a virus that can't harm you. It's like working our your immune system. Would you fight with no training. After your body is trained, when it does get infected with that virus, it can fight it off much easier. This doesn't guarantee survival. it just prepares you for the fight. There are many viruses living around us, and they constantly change and evolve. Sometimes, they evolve to something super deadly. Most viruses can't infect humans in their current form. They need to evolve to get us. The covid from 2020 is not the same covid from 2024. It has evolved .