>>82383590 (OP)
mRNA that induced some of your cells to produce the same spike proteins that COVID-19 produces, without a full-on COVID-19 infection, thus priming your immune system to attack actual COVID-19 because it got a sample of the spike proteins.
The problem and the reason the vaccines were fucking pointless is that COVID-19 is a rapidly mutating virus and the spike proteins its many variants produced quickly began to differ from the original, so a vaccine you got early on didn't do much later. Combine that with the fact that COVID-19's health impact on non-obese people is next to nothing and the vaccines were basically just a pointless, giant grift from pharma companies, who got paid massive amounts of your tax dollars for borderline useless vaccines.