WHAT REALLY IS THIS mRNA TECHNOLOGY

I NEED CLARIFICATION AS TO THIS mRNA TECHNOLOGY THAT DELIVERSTHIS GENETIC INFORMATION & WHERE DOES THIS GENETIC INFO COMES FROM????

• The Pfizer-BioNTech and Moderna vaccines are similar in that they both use mRNA technology to deliver a small amount of genetic information to trigger the body's immune response.
• The ingredients for both vaccines are very similar.
• Reports of allergic reactions to Pfizer’s COVID-19 vaccine have been made. Polyethylene glycol is the chemical suspected to have induced an allergic reaction

Polyethylene glycol (PEG) is made from ethylene glycol (ethane-1,2-diol), the main ingredient in antifreeze.