Active immunization refers to the process of inducing an immune response in an individual by exposing them to an antigen or pathogen. Synonyms for active immunization include vaccination, inoculation, immunization, and prophylaxis. The goal of active immunization is to stimulate the immune system to produce antibodies against the pathogen, providing protection against future exposures and potential infections. Vaccines are the most common form of active immunization, and are used to prevent infectious diseases such as measles, mumps, and rubella. Inoculation and immunization refer to the introduction of a weakened or dead pathogen into the body to stimulate an immune response. Prophylaxis refers to the use of preventative measures such as vaccines to protect against disease.