Though the two words are often used interchangeably, but there is a slight difference between the two words -
Vaccination: It is a product that stimulates a person’s immune system to produce immunity to a specific disease, protecting the person from that particular disease.
Herein Vaccines are usually provided through needle injections, but can also be administered by mouth or sprayed into the nose.
Immunization: It is the process wherein a person is made immune or we can say resistant to an infectious disease, typically by the administration of a vaccine. Here, Vaccines stimulate the body’s own immune system to protect the person against subsequent infection or disease.
A person becomes immune to a disease when the body has been exposed to it either through illness or vaccination. The immune system develops antibodies to the disease so that it cannot make you sick again.