Question

What is immunisation

Answer 1

Immunization, or immunisation, is the process by which an individual's immune system becomes fortified against an agent (known as the immunogen).

When this system is exposed to moleculesthat are foreign to the body, called non-self, it will orchestrate an immune response, and it will also develop the ability to quickly respond to a subsequent encounter because of immunological memory. This is a function of the adaptive immune system. Therefore, by exposing an animal to an immunogen in a controlled way, its body can learn to protect itself: this is called active immunization.
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Answer 2

Answer:

It is the process of injecting dead or weakened germ or germ substance of a disease into a persons body to develop immunity against that particular disease .