https://vaccination-info.europa.eu/en/about-vaccines/how-vaccines-work
How vaccines work
Vaccines teach our immune systems how to fight off disease. Learn how they work to protect us from getting sick.
how vaccines work
https://medlineplus.gov/genetics/understanding/therapy/mrnavaccines/
What are mRNA vaccines and how do they work?: MedlinePlus Genetics
mRNA vaccines use a piece of mRNA that corresponds to a protein on a virus. Vaccines for COVID-19 are the only mRNA vaccines authorized or approved by the FDA.
mrna vaccinesworkmedlineplusgenetics