Final answer:
Vaccination is the process of introducing altered antigens to produce an immune response and develop immunity. It involves exposing a person to a modified or weakened pathogen through injection, triggering an immune response and preparing the body for future encounters with the same antigen.
Step-by-step explanation:
Vaccination is the process of introducing altered antigens to produce an immune response. It involves exposing a person to a modified or weakened pathogen, usually through injection, in order to stimulate the immune system to develop immunity. The injected antigen triggers an immune response and prepares the body for future encounters with the same antigen. Vaccination is an effective method of preventing diseases and developing artificial immunity.