Explain briefly how vaccines work. Use the word memory in your answer

Does the vaccine help, and how does it work? I asked myself this question when I heard the news about it. Initially, I did not have exact data on how it works and whether the vaccine saves a person in general. But over time, I came across many comments that the vaccine does not help the person with the disease.

And here is my opinion, I believe that the vaccine partially weakens the disease and the risk of getting sick again is reduced. I got this idea from a friend who thought the same way. Although I still haven't been vaccinated because I'm afraid, I advise others. Vaccination can help you from death, from disease, and from suffering during illness. I am glad that I shared my thoughts with you and I wish you not to get sick and be happy all your life.