you do realise what they mean by immunity - it means thatyour immune system will recognise the disease and produce antibodies to fight it .. but if you need a definitionwell then they should stop using the word vaccine, this is like if McDonalds offers a free chesseburger and then it doesn't even have the cheese on it
Vaccine:
"A substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease."
Types of Immunity to a Disease | CDC
Immunity to a disease is achieved when there are antibodies to that disease in a person’s system. There are two types of immunity: active and passive.
www.cdc.gov
immunity to a disease is achieved through the presence of antibodies to that disease in a person’s system. Antibodies are proteins produced by the body to neutralize or destroy toxins or disease-carrying organisms. Antibodies are disease-specific. For example, measles antibody will protect a person who is exposed to measles disease, but will have no effect if he or she is exposed to mumps.
There are two types of immunity: active and passive.
Active Immunity
Active immunity results when exposure to a disease organism triggers the immune system to produce antibodies to that disease. Exposure to the disease organism can occur through infection with the actual disease (resulting in natural immunity), or introduction of a killed or weakened form of the disease organism through vaccination (vaccine-induced immunity). Either way, if an immune person comes into contact with that disease in the future, their immune system will recognize it and immediately produce the antibodies needed to fight it.
Active immunity is long-lasting, and sometimes life-long.