It is the process of giving a vaccine to an individual to protect him or her against a disease.
Thus, it is the process, which helps the body to generate an immune response naturally through vaccines.
A biological preparation, which provides active acquired immunity to a specific infectious disease is known as a vaccine.
It is identical to the immunity one attains from a disease.
A complex biological system endowed with the tendency to tolerate and identify whatever belongs to the self, and to determine and reject what is non-self or foreign is immunity.