Abstract: When we are vaccinated, our body is much prepared to shield off against the viruses by making the immune system strong and effective against the covid-19. The other main reason of vaccination is to break the chain of spread. In less common side effect reported for some covid-19 vaccines have included serve allergic reaction such as anaphylaxis, this reaction is extremely rare where have some typical side effect include pain at injection site, fever, fatigue, headache, muscle pain, chills and diarrhea. The chances of any of these side effects some covid-19 vaccines making up people sick with covid-19. Even though has a some side effect vaccine are safe and it help protect against covid-19 Covid-19 vaccine were developed by using science which has been in the books from the old ages. Covid-19 vaccine has been tested by multiple drug administration authorities in the world. A vaccine is the safe way to improve your immune system, it teaches our body to fight against the threat.