Immunizations are important for a variety of reasons. By receiving an immunization for a disease, a person defends against catching that disease.
The benefits do not stop there. Society gains a collective immunization as more people become immune to a particular disease.
Once a collective immunization has been established, once-dangerous diseases can be eradicated.
Polio, for example, was eliminated in the United States in 1979 after vaccinations became widespread. The CDC estimates 21 million hospitalizations and 732,000 deaths will be avoided among children born in the last 20 years as a result of vaccines.