Answer: Vaccination can be defined as a process to prepare the body so that it can prevent the body from diseases.
Vaccine is an attenuated form of microorganism that is given to the body so that it can get prepared for the actual infection.
The attenuated form of organisms evoke primary immune response against a particular antigen by which B cells produce antibodies as well as memory cells against it.
When body encounters this antigen again, these memory cells could easily recognize the antigen and produce a quicker and amplified response that is, a secondary response.