How do the vaccines interact with the acquired immune system?:
The acquired immunity system is the system that is composed of highly specialized cells and systemic processes that eliminate or avoid pathogen threats. Among its functions are the recognition of foreign elements or antigens, their elimination in a subsequent encounter, and generation of immune memory.
How does it benefit individuals?
In this range of ideas, Vaccines utilize this adaptive immunity and memory to expose the body to the antigen without causing disease, so that when then live pathogen infects the body, the response is rapid and the pathogen is prevented from causing disease.
That is, the adaptive immune response provides the vertebrate immune system with the ability to recognize and remember specific pathogens, such as viruses. In this way, it offers more powerful responses each time the pathogen is re-encountered. It is an adaptive immunity so that the body's immune system is prepared for future threats.